Astronomy

Fewer supermassive black holes may undergo growth spurts than astronomers had suspected.

Every known large galaxy hosts a gargantuan black hole at its center. Some of those behemoths experience bursts of beefing up, during which time they blaze brightly. But recent observations from the James Webb Space Telescope turned up far fewer of these active black holes than expected, researchers report in a paper submitted August 22 at arXiv.org.

If confirmed, the finding raises questions about how some supermassive black holes got to be so big and what, if any, impact they have on the galaxies they inhabit.

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Huge black holes, such as the one at the center of the Milky Way, tend to be pretty quiet (SN: 6/28/23). But occasionally, a surge of interstellar detritus rains down upon them — often following a collision with another galaxy — creating what’s called an active galactic nucleus, or AGN. Here, the heart of the host galaxy emits copious amounts of light at all wavelengths as the influx of material swirling around the black hole heats up. An AGN can not only outshine their host galaxies, but they are also the brightest persistent sources of light in the universe.

In 2017, astronomer Allison Kirkpatrick of the University of Kansas in Lawrence and colleagues predicted that JWST’s infrared eyes would find lots of these active black holes based on observations from other, less sensitive, space-based infrared telescopes. In the new study, Kirkpatrick and her team turned JWST toward a well-studied strip of sky where, in 2008, the Spitzer Space Telescope had found infrared signatures of active galactic nuclei in nearly a third of the 19 galaxies it studied.

Those galaxies, seen as they were around the peak of cosmic star formation roughly 10 billion years ago, were all relatively bright and massive. JWST is much more sensitive than Spitzer, so it’s capable of spotting fainter, more average-sized galaxies at the same epoch — ones more comparable in size to the Milky Way. And yet, out of the nearly 500 galaxies that JWST spotted, all observed for the first time, just 6 percent appear to contain active galactic nuclei, the team reports.

“We are actually probing a new population” of galaxies, says Tonima Tasnim Ananna, an astronomer at Wayne State University in Detroit, who was not involved with the study. The new data come from the far reaches of the universe, a region now more accessible than ever before thanks to JWST.

The new-to-us galaxies appear to be filled with interstellar dust. So it is possible, Kirkpatrick says, that fast-growing black holes are hiding in these distant dusty galaxies, and researchers just don’t have the technical capabilities to identify them yet.

If there really aren’t as many of these fast-growing black holes as once thought, it would throw astronomers’ understanding of black hole and galaxy formation for a loop. Supermassive black holes can weigh as much as several million — or even several billion — suns. The AGN phase is thought to be an important step for gathering so much mass.

“Maybe all galaxies don’t go through this active phase, [and] their black holes grow pretty slowly,” Kirkpatrick says. This would mean that some supermassive black holes would need to have started out relatively hefty, rather than growing up from comparably tiny objects.  

And an active black hole doesn’t just grow quickly in isolation. It also affects its host galaxy. “It gets really, really hot” in an AGN, Kirkpatrick says. That can make it harder for the host galaxy to form stars, which need relatively cool gas to get started.

And the radiation pressure around a rapidly accreting supermassive black hole can be powerful enough to launch winds “like a trillion hurricanes just ripping through your galaxy,” Kirkpatrick says. These winds could, in turn, make things too unstable near the galaxy’s center for planets to form that are capable of sustaining life, she says. But if many black holes aren’t going through an AGN phase, they may not be influencing their host galaxies all that much.

Another explanation for the apparent dearth of active black holes in the new JWST data is that many supermassive black holes could grow up through periodic, short bursts of activity. In that case, they would have influenced the galaxy around them — but such bursts would be virtually undetectable.

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If the black holes “just flicker on and off for short time periods,” Kirkpatrick says, “you’re never going to find these things. You’re never going to be able to understand how the black holes are growing.”

More answers could be coming soon: Kirkpatrick is planning to use JWST again in January to conduct an even larger search. Instead of the nearly 500 galaxies used in this study, she says, “I’m going to have probably 4,000 galaxies to look at now.” More

One of a telescope operator’s primary jobs is to keep any stray light out of the instrument. Earthly and other unwelcome photons can swamp the cosmic light from distant stars and galaxies. During more than a decade as a project scientist for the James Webb Space Telescope, Jane Rigby obsessed over minimizing light leaks — with extraordinary success. The sky looks darker to JWST than most anyone had hoped.

Rigby herself, now the senior project scientist for JWST, is a source of light.

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“I remember the light in her eyes,” says astrophysicist Jane Charlton, who met Rigby the summer before her freshman year at Penn State and later advised her research. “Jane had incredible grades, but that’s not necessarily what I look for. The love of astronomy, and passion for that, is what I look for.”

Nearly three decades later, Rigby’s palpable joy in discussing the success of JWST, which launched on December 25, 2021, has made her one of the public faces of the telescope. She presented the telescope’s first images at the White House and has given keynote speeches at some of the biggest astronomy meetings (SN: 8/13/22, p. 30). During public appearances, she often wears JWST-themed socks, scarves and pins. “I have JWST socks for pretty much every day of the week,” she says.

She has also lit a path for queer astronomers, as well as others who are historically underrepresented in astronomy. Rigby has been out as part of the LGBTQ+ community since 2000, when she met her now-wife when they were both astronomy graduate students at the University of Arizona in Tucson. She has devoted much of her career to holding the door open for others.

“I didn’t grow up with any queer role models,” she says. “I hope I’m the last generation for which that’s true.”

Focusing on the instruments

Rigby remembers being asked to draw a favorite TV show in preschool. She used up an entire black crayon drawing Carl Sagan’s Cosmos.

Her interest in space crystallized into a career plan at about age 12, after she saw Sally Ride speak at a local college. Ride, the first American woman in space, made Rigby want to be an astronaut.

“I knew there were two paths to becoming an astronaut: a test pilot or a scientist,” she says. “And it was pretty clear that I was never going to be tall enough to fly the shuttle.” At 5 feet, 2 inches tall, she’s still two inches too short to have been a space shuttle pilot. If she couldn’t make it to space, she saw more potential in science than in flying planes.

Rigby’s first experience using a telescope for research, as an undergraduate student at Penn State, was stymied by light leaks. She, Charlton and another student traveled to western Texas to use the telescope at the McDonald Observatory. They were looking to catch light from a distant quasar filtering through a diffuse and mysterious cloud of cosmic gas. These small, dense clouds appear to be packed with heavy elements from supernova explosions, but surprisingly, they’re not found in galaxies’ centers where a lot of stars are born and dying. “We were, at that time, trying to figure out what they were,” Charlton says. “As we still are.”

After a night of guiding the telescope by hand, the group realized that light from something other than the quasar — maybe an alert light on an instrument panel — had flooded the telescope. The trio tracked it down, covered it with tape and tried again. The same thing happened night after night. Ultimately, they returned to Pennsylvania with no quasar data.

“It didn’t work,” Rigby says. “But it was really fun. I was learning everything, trying to learn how the telescope worked.”

Jane Rigby has had the opportunity to observe at many notable telescopes around the world, including the Magellan telescopes at the Las Campanas Observatory in Chile, shown here around 2011.J. Rigby

Since then, Rigby has used many major telescopes, from those at the Keck Observatory in Hawaii to the Magellan telescopes in Chile to the Spitzer and Hubble space telescopes. Along the way, her research developed a theme: investigating how galaxies grow and change along with the super­massive black holes hiding within.

But her approach is less “How can I answer this burning question?” and more “What can I do with this shiny new instrument?”

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“I’m a very observational astronomer,” she says. “I will use any telescope I can get my hands on.”

All that telescope time meant she was ready to join the JWST team when the opportunity came.

“Because she had seen data from Spitzer and Hubble,” JWST’s precursors, says astronomer Matt Mountain of the Association of Universities for Research in Astronomy in Washington, D.C., “she knew what she was looking for.”

Meeting the James Webb Space Telescope

Rigby began working on JWST in 2010, when she took a job at NASA’s Goddard Space Flight Center in Greenbelt, Md., as the telescope’s deputy operations project scientist.

One of the first things she did was read the report of an independent review panel that found that the telescope was mismanaged, over budget by billions of dollars and would launch years later than originally planned (SN: 11/11/10). “I’ve certainly been four years from launch multiple times,” she says.

Before launch, most of her time was devoted to making sure that changes to the telescope’s design wouldn’t mess up the science. She imagined possible ways to use JWST and met with other team members to make sure the final telescope would deliver on those goals. Would the telescope materials glow or release gases that could freeze to the machine? Could JWST use two cameras simultaneously? Could it study moving targets, like asteroids within the solar system (SN: 11/5/22, p. 14)?

“Because she is a working scientist who really wanted to use the data,” Mountain says, “she was an ideal choice for operations scientist,” a job she moved up to in 2018. “In these complex spaces, with all the engineering, the personalities, the politics at NASA, working with contractors, she always keeps her eye on the prize: What science are we trying to do?”

Rigby bridged the divide between the science and engineering teams, helping them speak a common language. Her job has been “a lot of active listening and soft power, a lot of synthesizing and a dose of specialized technical expertise,” she says. “Oftentimes I’m the big-picture person in a room full of specialists.”

Thousands of people worked on the James Webb Space Telescope, shown here at NASA’s Goddard Space Flight Center in 2017.Desiree Stover/NASA

Engineer Larkin Carey removes the cover that kept the telescope’s instruments safe from contaminants and stray light while it was being assembled and tested.CHRIS GUNN/NASA

After the telescope launched, got in position and unfolded itself — “the six-month unwrapping of the Christmas present,” Rigby says — her job shifted to characterizing how well the telescope works. In practically every metric, it’s a dream come true.

There’s better-than-expected image quality, higher sensitivity, faster response times and a longer potential mission lifetime than predicted before launch — and practically no light leaks. The telescope’s great golden mirrors are exposed to space, and light can scatter off dust grains on the mirrors, registering on images as faint, diffuse patterns the team calls “wisps” and “claws,” or a ghostly streak dubbed “the lightsaber.” But the mirrors proved remarkably dust-free, meaning the sky appears incredibly dark.

“It’s not an accident that the telescope works so well,” she says. “That was careful work beforehand.”

When asked about such successes, and her own, Rigby points to a huge amount of work by tens of thousands of people. “I understand the desire to humanize something that can seem really big and impersonal. But I don’t like the singling out,” she says. “I try to reflect it back to the team.” It took thousands of people and tasks to ensure JWST’s success. Engineer Larkin Carey, with Ball Aerospace, for example, cleaned every square centimeter of the telescope’s mirrors by hand with a tool like a shaving brush, Rigby says.

With the telescope working so well, Rigby could turn her attention to the scientific questions. She helps lead an observing program called TEMPLATES, looking at galaxies whose light has been magnified by foreground objects to get a glimpse at how the galaxies form stars. At a June meeting in Albuquerque of the American Astronomical Society, Rigby shared how the TEMPLATES team found hydrocarbons, “the same stuff that smoke is made of,” in a galaxy whose light dates back more than 12 billion years — the furthest back in time such molecules had ever been seen.

Early in July, Rigby became the senior project scientist for JWST; it’s her job to figure out how to get the most and best science out of the telescope.

Research colleagues describe her as superhuman. “I don’t know how she does everything that she does, and does everything well,” says TEMPLATES collaborator Keren Sharon of the University of Michigan in Ann Arbor. And Rigby’s enthusiasm is abundant: “She gets giddy,” Sharon says. “It could be about figuring out a bug, or discovering this super exciting thing about a galaxy that we didn’t know before … and she’s literally bouncing. Her face lights up.”

With data from the James Webb Space Telescope, Rigby and colleagues found signs of hydrocarbons in this galaxy (red ring, shown in false color) more than 12 billion light-years from Earth. A second, closer galaxy (blue) lined up perfectly to magnify the light from the more distant one.J. SPILKER, S. DOYLE, NASA, ESA, CSA

Opening doors for others

Rigby wants anyone to be able to experience and pursue that enthusiasm. When she started attending American Astronomical Society meetings in the 1990s, she didn’t know there was a secret LGBTQ+ networking dinner. “You had to know it existed. That was a little closety. But it’s where people were.”

At the time, there was a lack of protection from employment discrimination and no guarantee of institutional support for astronomers with same-sex partners. Rigby recalls accepting a fellowship at Carnegie Observatories in Pasadena, Calif., and immediately having to request health insurance benefits to cover her partner.

“That’s awkward,” she says. “You want to be talking about your science and your telescope proposals, not how can I get health insurance for my family because we’re different.” Finding other LGBTQ+ astronomers was “a lifeline,” she says.

These days, the meet-up at AAS is too big to go out to dinner. At a January 2023 meeting in Seattle, “we lost count at 120 people. We had to spill out into the hallway,” Rigby says. “That feels good.”

Seeing queer astronomers like Rigby so far along in their careers was helpful to Traci Johnson, a data scientist who was a graduate student in astronomy in Sharon’s lab at the University of Michigan. Johnson identifies as lesbian and nonbinary and came out during graduate school. “I realized it is possible to be out, and be happy, and also have a really amazing career,” Johnson says.

Rigby has taken an active role in encouraging inclusivity, though she seems to be up against the legacy of JWST’s namesake. Many astronomers have called for the telescope to be renamed because James Webb was NASA administrator at a time when the U.S. government fired employees for being gay.

Rigby won’t comment on the telescope’s name. But her support for LGBTQ+ astronomers is clear. Rigby was a founding member of the AAS Committee for Sexual-Orientation and Gender Minorities in Astronomy, which works to promote equality for LGBTQ+ astronomers within the field; has co-organized conferences on making astronomy more inclusive; and authored a recent white paper urging the astronomy community to address diversity, inclusion and harassment. A current priority is making sure trans people feel safe and welcome.

Rigby doesn’t want to be pigeonholed as “the gay astronomer.” She knows her contributions to astronomy extend far beyond any particular group. But she says the leadership skills, resilience and ability to shift her perspective that she has learned through living and organizing as a member of the LGBTQ+ community have made her a better astronomer. They’re skills she transfers to her role as a leader at NASA.

“The whole vision is, you get to bring your authentic self to work,” she says. “And work embraces your authentic self.” More

The Milky Way might have once looked more like a legume than a starry whirlpool.

Over their unfathomably long lifetimes, spiral galaxies like the Milky Way are generally thought to morph into lentil-shaped “lenticular” galaxies and then into elliptical blobs (SN: 4/23/18). But an analysis of nearby galaxies suggests that our galaxy, and others like it, was once lenticular, astronomer Alister Graham reports in the July Monthly Notices of the Royal Astronomical Society. If correct, Graham’s proposed update to the evolutionary sequence of galaxies would rewrite the history of the Milky Way.

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“Lenticulars have always been sort of the abandoned stepchild of [galaxy] morphology,” says astronomer Christopher Conselice of the University of Manchester in England, who wasn’t involved in the study. But this paper puts them into focus, he says, as being a major aspect of how galaxies change.

Lenticulars get their name from the way their entire halo of stars, when viewed edge on, bulges in the middle and thins out toward the sides, much like a lentil. These galaxies exhibit a confusing mix of properties that’s made their presumed place in the middle of galaxy evolution sequences rather suspect.

“We’ve known for a while that that’s almost certainly not correct,” Conselice says. Particularly puzzling is that lenticulars, despite their spiral-like disks, don’t have lots of gas, which hinders them from producing new stars. Spiral galaxies do have lots of star-forming gas, and scientists aren’t sure why lenticular galaxies don’t.

Graham, of Swinburne University of Technology in Hawthorn, Australia, found new clues to this mystery of galaxy evolution by considering black holes.

Most galaxies harbor a supermassive black hole in their center, and when galaxies merge, so do those black holes. This makes the mass of a galaxy’s black hole a kind of record of its past collisions. If a galaxy got big by gobbling up its neighbors rather than by sucking up surrounding gas, its black hole should be hefty relative to the swarm of stars that surrounds it.

Using images from the Hubble and Spitzer space telescopes, Graham compared the black hole and stellar masses of about 100 nearby galaxies. For galaxies of the same shape, he saw that black hole mass and stellar mass tend to be linked in a predictable way — except for the lenticular galaxies.

When Graham took a closer look at the lenticulars, he realized they are actually two distinct groups that had been lumped together: those that have lots of interstellar dust and those that do not. This division, which he previously reported in the May Monthly Notices of the Royal Astronomical Society, could have been a superficial aesthetic difference. But the galaxies’ black hole masses suggest otherwise.

Dust-poor and dust-rich lenticulars have entirely different relationships between their black hole masses and stellar masses, suggesting different histories and explaining the apparently scattered behavior of lenticular galaxies. The dusty galaxies tend to have a heftier supermassive black hole than the ones found in both spirals and dust-poor lenticulars. Dust-poor lenticulars are usually on the small side in terms of both black hole mass and stellar mass.

This led Graham to conclude that spiral galaxies are actually in between the two types of lenticulars, evolutionarily speaking. His new analysis suggests that dust-poor lenticulars become spirals after capturing small “satellite galaxies” and other minor mergers — bumping up their black hole masses — and scooping up nearby gas.

When spirals collide with other substantial galaxies, he proposes, they become dust-rich lenticulars — and indeed, he adds, every dust-rich lenticular in his dataset was previously recognized as the remnant of a spiral galaxy merger. Collisions between these dust-rich lenticulars are then enough to finally erode the galaxies’ discs of stars and destroy their dust, producing blobby elliptical galaxies. 

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Black holes are a good tracer of galaxy evolution, Conselice says, but the new sequence could be controversial. One issue, he says, is that lenticular galaxies in the nearby universe are usually such lightweights that they would need to merge tens or even hundreds of times — far more than the expected average of around three over 10 billion years — to form a large spiral galaxy.

But things might have been different in the early universe, he adds. Long ago, there could have been more massive lenticulars. Figuring that out might be possible with the James Webb Space Telescope, which can see incredibly faint infrared light, so is allowing scientists to peer farther away — and further back in time — than ever before (SN: 12/16/22).

“If you could look in the more distant universe, you could potentially see some of these galaxies when they’re first forming, or when they’re evolving,” Conselice says. “We could potentially really test this idea.” More

Samples of the asteroid Ryugu contain bits of stardust that predate the birth of our solar system.

Slivers of Ryugu material, snagged by the Japanese Hayabusa2 spacecraft, appear to come from the solar system’s frozen fringes, rather than from the asteroid itself, scientists report July 14 in Science Advances. These foreign fragments could illuminate details of the solar system’s history.

Finding these fragments “is really unique,” says cosmochemist Ann Nguyen of NASA’s Johnson Space Center in Houston. “It’s showing us a new type of material, but also telling us about the dynamics of material from the outer solar system.”

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The Hayabusa2 spacecraft visited the asteroid in 2018 and 2019, then returned to Earth with 5.4 grams of the space rock in 2020 (SN: 12/7/20). Scientists examined those samples in the lab in ways that can’t be done with telescopes or even spacecraft, like getting detailed measurements of chemical composition.

So far, those examinations have shown that Ryugu is rich in carbon, that it’s made of the same material as some of the rarest meteorites found on Earth, and that it was altered by water at some point in its past (SN: 6/9/22). Scientists think that Ryugu formed from the debris of a larger asteroid, which broke up in a collision and re-formed into a loose pile of rubble (SN: 3/20/19).

Nguyen, however, was searching for something different. “My focus of research is presolar grains,” tiny specks of material that formed from the ashes of dying stars, she says (SN: 1/13/20). “I was on the hunt for them.” These delicate grains contain different isotopes — atoms of an element that have different numbers of neutrons — than those formed by the sun, giving away their alien origins.

Nguyen and her colleagues examined two samples of Ryugu, each less than a millimeter in size. They then picked out tiny slivers of rock, 50 to 200 micrometers wide, called clasts, that stood out from the rest of the Ryugu sample.

Using scanning electron microscopes and other imaging techniques, Nguyen and colleagues found that two of the clasts are chemically different from the rest of Ryugu, with lower oxygen, magnesium and silicon contents, and greater amounts of iron and sulfur.

Electron microscope images of a sliver of solar system material (outlined in white) in a sample of the asteroid Ryugu show that the material is different from the rest of the asteroid. The different colors highlight different elements in the sample: oxygen (magenta), magnesium (green), silicon (light blue), iron (dark blue) and sulfur (yellow). The slivers also contain grains of silicates (white arrows) that come from outside the solar system.A. Nguyen et al/Science Advances 2023

The clasts also have much higher concentrations of presolar grains than the rest of the Ryugu material. The grains contain silicon carbide, which is easily destroyed by water, plus an extra abundance of organic matter.

That means the grains could not have been part of Ryugu’s parent body, which was extensively altered by water. The researchers think the grains were bits of a comet that formed in the outer solar system’s Kuiper belt, where the conditions were cool and dry. Then the grains sprinkled onto the rubble that formed Ryugu sometime between the original asteroid’s destruction and the rubble pile’s formation.

“Between these events, it kind of collected some other friends that came from other bodies, from different parts of the solar system,” Nguyen says. It’s not yet clear how material from the outer solar system found its way to Ryugu. Perhaps the asteroid formed farther from the sun — and hence, closer to the Kuiper belt — than it is today. “It’s interesting to visualize how this asteroid came about and what it gathered along the way.”

The discovery is “very exciting,” says cosmochemist Philipp Heck of the Field Museum of Natural History in Chicago, who was not involved in the new work. “These clasts that got incorporated into Ryugu after it formed, they’re really valuable. I think they’re even more valuable than the Ryugu sample itself.”

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The clasts can reveal what the unaltered ingredients that formed the solar system were made of. Think of the disk that formed the planets as bread dough, Heck says. Once the dough is well-mixed, it’s hard to tell what went into it. Clasts like the ones in the Ryugu sample are like bits of unmixed flour that survived intact in the final loaf, he says — not delicious, but very informative.

“If we want to understand the ingredients from which the solar system formed, the original ingredients, we need to find these very rare, unaltered clasts,” Heck says. “This is one of them.” More

Plasma rain in the sun’s atmosphere makes a splash when it lands. New observations from the European Space Agency’s Solar Orbiter have revealed previously unseen details of how this coronal rain falls, including bright fireball effects and sudden upward surges in plasma.

“These are the highest resolution images we have ever obtained from the solar corona,” says solar physicist Patrick Antolin of Northumbria University in Newcastle upon Tyne, England. He presented the results at the National Astronomy Meeting in Cardiff, Wales, the week of July 3 and in a paper to be published in Astronomy & Astrophysics.

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The corona is the sun’s wispy upper atmosphere, the sizzling tangle of plasma and magnetism that is visible during a total eclipse (SN: 6/30/19). When clumps of scorching-hot plasma in the corona suddenly cool, they condense and fall toward the solar surface, just like water droplets in Earth’s atmosphere. This coronal rain has been observed before, but details of its formation and falling were fuzzy (SN: 5/24/18).

The 2020 launch of Solar Orbiter promised to change that (SN: 2/9/20). The probe is making passes over the sun’s unexplored polar regions, carrying high resolution cameras and other instruments to investigate solar mysteries. In late March 2022, Solar Orbiter made its closest approach to the sun to date, swooping within 49 million kilometers of our star — about a third of the distance between the sun and Earth.

In images from the spacecraft taken during that close encounter, Antolin and colleagues discovered a new feature in the coronal rain. As the plasma raindrops fell, the region immediately below them brightened. The researchers think the brightening came from other plasma below the falling rain getting compressed and heated, similar to the way meteors in Earth’s atmosphere can create fireballs just ahead of the falling rocks (SN: 2/15/13).

“This is the first time we’ve seen that kind of compression from the rain falling this clearly,” says Emily Mason, a solar physicist at Predictive Science, a research company based in San Diego, who was not involved in the study. “The resolution just wasn’t there before.”

Antolin and colleagues also saw a rebound and upward flow of material after coronal raindrops smacked onto the chromosphere, the thin layer of plasma that lies between the sun’s visible surface and the corona.

“This rain is as dense as the chromosphere,” Antolin says. “It can fall to the chromosphere and then make a splash.” This sort of splash was predicted in computer simulations but had never been observed on the actual sun before.

On their own, the observations won’t directly solve the biggest solar mysteries, like why the diffuse corona sizzles at millions of degrees Celsius higher than the surface of the sun (SN: 8/20/17). But more observations of the same phenomena can help figure out details of the coronal environment, like how easily its gas compresses, or what its chemical composition is.

“We are not able to send a probe to the inner part of the corona because it’s so hot,” Antolin says. “So we can use these observations as indirect probes of the local environment.”

The observations are “an important litmus test for Solar Orbiter itself,” Mason says. “It’s good to see what Solar Orbiter is capable of.” More

Citations
G. Agazie et al. The NANOGrav 15-Year data set: Detector characterization and noise budget. Astrophysical Journal Letters. Published online June 28, 2023. doi: 10.3847/2041-8213/acda88.G. Agazie et al. The NANOGrav 15-year data set: Evidence for a gravitational-wave background. Astrophysical Journal Letters. Published online June 28, 2023. doi: 10.3847/2041-8213/acdac6.G. Agazie et al. The NANOGrav 15-year data set: Observations and timing of 68 millisecond pulsars. Astrophysical Journal Letters. Published online June 28, 2023. doi: 10.3847/2041-8213/acda9a.A. Afzal et al. The NANOGrav 15-year data set: Search for signals from new physics. Astrophysical Journal Letters. Published online June 28, 2023. doi: 10.3847/2041-8213/acdc91G. Agazie et al. The NANOGrav 15-year data set: An astrophysical interpretation of a gravitational wave background from supermassive black hole binaries. Astrophysical Journal Letters. In press, 2023.J. Antoniadis et al. The second data release from the European Pulsar Timing Array I. The dataset and timing analysis. Astronomy & Astrophysics. Published online June 28, 2023.J. Antoniadis et al. The second data release from the European Pulsar Timing Array II. Customised pulsar noise models for spatially correlated gravitational waves. Astronomy & Astrophysics. Published online June 28, 2023.J. Antoniadis et al. The second data release from the European Pulsar Timing Array. III. Search for gravitational wave signals. Astronomy & Astrophysics. Published online June 28, 2023.A. Zic et al. The Parkes Pulsar Timing Array Third Data Release. Publications of the Astronomical Society of Australia. Published online June 28, 2023.D.J. Reardon et al. Search for an isotropic gravitational-wave background with the Parkes Pulsar Timing Array. Astrophysical Journal Letters. Published online June 28, 2023. D.J. Reardon et al. The gravitational-wave background null hypothesis: Characterizing noise in millisecond pulsar observations with the Parkes Pulsar Timing Array. Astrophysical Journal Letters. Published online June 28, 2023.H. Xu et al. Searching for the Nano-Hertz Stochastic Gravitational Wave Background with the Chinese Pulsar Timing Array Data Release I. Research in Astronomy and Astrophysics. Vol. 23, July 2023, p. 075024. doi: 10.1088/1674-4527/acdfa5. More

One of the oldest known objects in the universe is wandering around the Milky Way.

Star cluster M92, a densely packed ball of stars roughly 27,000 light-years from Earth, is about 13.8 billion years old, researchers report in a paper submitted June 3 to arXiv.org. The newly refined age estimate makes this clump of stars nearly the same age as the universe.

Refining the ages of clusters like M92 can help put limits on the age of the universe itself. It can also help solve cosmic conundrums about how the universe evolved.

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The age is “on the edge of the age of the universe, as estimated by other groups,” says astronomer Martin Ying of Dartmouth College. “It helps us set the lower bound of the age of the universe. We don’t expect M92 to be born before the universe, right?”

Globular clusters like M92 are tight knots of stars that are thought to have all formed at the same time. That makes it easier for astronomers to measure the stars’ ages (SN: 7/23/21). Stars that are born at different masses have different fates: The big ones use up their fuel quickly and die young, and the small ones linger. Figuring out how many of the cluster’s stars have aged out of the main parts of their fuel-burning years gives a sense of when the whole cluster was born.

But those estimates rely on assumptions about how stellar evolution works. Ying and colleagues wanted to find an age measurement that would sidestep those assumptions.

Using a computer, the team created 20,000 synthetic stellar populations for M92, each for a different possible cluster age. They then compared the colors and brightnesses for each of these populations with Hubble Space Telescope observations of M92 and calculated the age that fit the collection best.

This isn’t the first time astronomers have measured M92’s age, but previous estimates relied on just one synthetic collection of stars. Comparing thousands of them reduced the uncertainty introduced by the assumptions baked into each one. The new technique reduced the uncertainty of the cluster age by about 50 percent, Ying says. The team found the cluster is 13.8 billion years old, give or take 750 million years. That’s strikingly close to the best estimate of the age of the universe: a smidge over 13.8 billion years, plus or minus 24 million years, according to the Planck satellite’s measurement of the first light emitted after the Big Bang (SN: 12/20/13).

The age of clusters like M92 is important partly because of a rising tension over how fast the universe is growing. Astronomers have known since the 1990s that the universe is expanding at an ever-increasing rate, thanks to a mysterious substance dubbed dark energy (SN: 8/25/22). But recent measurements of the rate of that expansion, a figure called the Hubble constant, disagree with each other (SN: 7/30/19).

One way around that tension is to accept a different age for the universe, says cosmologist and study coauthor Mike Boylan-Kolchin of the University of Texas at Austin.

“We often think about it as, Moses came down from Mount Sinai with ‘13.8 billion years’ written on some tablets or something, but it’s not quite like that,” he says. “If one takes the Hubble tension seriously, then one also has to say we don’t know the age of the universe that well.”

That’s where M92 comes in. Before spacecraft measured the cosmos’ earliest light, globular cluster ages were the best way to place limits on the age of the universe. That practice had fallen out of fashion for a while, says cosmologist Wendy Freedman of the University of Chicago, who was not involved in the new work.

But improvements in computing, theory, and measurements of the distances to clusters like M92 make it worth trying again.

“The Hubble tension itself is a really challenging nut to crack,” Freedman says. This measurement alone isn’t precise enough to settle the debate. But “the more kinds of constraints we have, the better,” she says. “It’s showing a way for the future.” More

Ashley Yeager is the associate news editor at Science News. She has worked at The Scientist, the Simons Foundation, Duke University and the W.M. Keck Observatory, and was the web producer for Science News from 2013 to 2015. She has a bachelor’s degree in journalism from the University of Tennessee, Knoxville, and a master’s degree in science writing from MIT. More