Latest news with #SwiftX-ray
Yahoo
11-04-2025
- Science
- Yahoo
For the first time, astronomers watch a black hole ‘wake up' in real-time
A black hole is a terrifying concept, but the mysterious nexus of physics and space-time isn't always gobbling up matter. While famous for devouring anything and everything in its gravitational pull, black holes aren't constantly destructive. In fact, they often exhibit long periods of dormancy. Astronomers had never witnessed a black hole 'wake up' in real time—until now. Researchers have spent the past few years watching a black hole re-awaken roughly 300 million light-years away from Earth. And what they've documented challenges prevailing theories about black hole lifecycles. The groundbreaking observations are detailed in a study published on April 11 in Nature Astronomy. For decades, the supermassive black hole anchoring a galaxy known as SDSS1335+0728 in the Virgo constellation hasn't displayed much activity. But beginning in late 2019, astronomers noticed it began to emit intermittent, bright flashes of energy. They soon reclassified the galaxy's center as an active galactic nucleus nicknamed 'Ansky,' and enlisted telescopes from NASA and the ESA to help study the unexpected event. 'When we first saw Ansky light up in optical images, we triggered follow-up observations using NASA's Swift X-ray space telescope, and we checked archived data from the eROSITA X-ray telescope, but at the time we didn't see any evidence of X-ray emissions,' Paula Sánchez Sáez, a researcher at the European Southern Observatory in Germany and lead researcher of the first team to study Ansky, said in a statement. Fast forward to February 2024 when Lorena Hernández-García at Chile's Valparaiso University began detecting even more regular X-ray bursts from Ansky. The rare events allowed astronomers to once again aim their tools like the XMM-Newton X-ray space telescope and NASA's Chandra, NICER, and Swift telescopes at Ansky. Hernández-García and collaborators then determined the black hole was displaying a phenomenon known as a quasiperiodic eruption, or QPE. 'QPEs are short-lived flaring events. And this is the first time we have observed such an event in a black hole that seems to be waking up,' said Hernández-García. XMM-Newton proved particularly critical to studying Ansky's behavior, since it is the only telescope sensitive enough to capture fainter background X-ray light amid the black hole's stronger X-ray bursts. By comparing the two phases, astronomers could calculate the amount of energy released by Ansky during its more active periods. While a black hole inevitably destroys everything it captures, objects behave differently during their impending demise. A star, for example, generally stretches apart into a bright, hot, fast-spinning disc known as an accretion disc. Most astronomers have theorized that black holes generate QPEs when a comparatively small object like a star or even a smaller black hole collides with an accretion disc. In the case of Ansky, however, there isn't any evidence linking it to the death of a star. 'The bursts of X-rays from Ansky are ten times longer and ten times more luminous than what we see from a typical QPE,' said MIT PhD student and study co-author Joheen Chakraborty. 'Each of these eruptions is releasing a hundred times more energy than we have seen elsewhere. Ansky's eruptions also show the longest cadence ever observed, of about 4.5 days.' Astronomers must now consider other explanations for Ansky's remarkable behavior. One theory posits that the accretion disc could come from nearby galactic gas pulled in by the black hole instead of a star. If true, then the X-rays may originate from high energy shocks to the disc caused by a small cosmic object repeatedly passing through and disrupting orbital matter. As it stands, astronomers possess more QPE models than data from actual events. Thanks to Ansky's reawakening, that may soon change. 'We don't yet understand what causes them,' said Hernández-García. 'Studying Ansky will help us to better understand black holes and how they evolve.'
Yahoo
11-04-2025
- Science
- Yahoo
NASA spacecraft spots monster black hole bursting with X-rays 'releasing a hundred times more energy than we have seen elsewhere'
When you buy through links on our articles, Future and its syndication partners may earn a commission. We've all woken up in a terrible mood from time to time, but a newly observed monster black hole is really having a bad day. The previously inactive supermassive black hole at the heart of the galaxy SDSS1335+0728, located about 300 million light-years away from us, was seen erupting with the longest and most powerful X-ray blasts ever seen from such a cosmic titan. This active phase marks the start of the supermassive black hole devouring matter around it and erupting with short-lived flaring events called quasiperiodic eruptions (QPEs). The black hole, which has remained quiet for decades, is responsible for a region at the heart of its galaxy called an "active galactic nucleus," or "AGN." The team has dubbed this AGN "Ansky." The awakening of Ansky was first detected in late 2019, alerting astronomers who followed up on its manifestation with NASA's Swift X-ray space telescope. By Feb. 2024, astronomers had begun to see the black hole powering Ansky erupting with flares at fairly regular intervals. This offered a unique opportunity: It became possible to monitor a feasting and erupting supermassive black hole in real time. "The bursts of X-rays from Ansky are ten times longer and ten times more luminous than what we see from a typical QPE," team member Joheen Chakraborty of the Massachusetts Institute of Technology (MIT) said in a statement. "Each of these eruptions is releasing a hundred times more energy than we have seen elsewhere. Ansky's eruptions also show the longest cadence ever observed, of about 4.5 days. "This pushes our models to their limits and challenges our existing ideas about how these X-ray flashes are being generated.' The team's QPE observations were made possible with assistance from the European Space Agency (ESA) space mission XMM-Newton, NASA's NICE and Chandra missions, and archival data from eROSITA. The team remains puzzled about the cause of Ansky's outbursts. QPEs have previously been associated with supermassive black holes capturing stars, ripping them apart, and devouring the remains. That stellar destruction doesn't seem to be happening for Ansky. "For QPEs, we're still at the point where we have more models than data, and we need more observations to understand what's happening," ESA Research Fellow and X-ray astronomer, Erwan Quintin, said in the statement. "We thought that QPEs were the result of small celestial objects being captured by much larger ones and spiraling down towards them. "Ansky's eruptions seem to be telling us a different story." Related Stories: — Is our universe trapped inside a black hole? This James Webb Space Telescope discovery might blow your mind —James Webb Space Telescope finds our Milky Way galaxy's supermassive black hole blowing bubbles (image, video) — Tiny black holes left over from the Big Bang may be prime dark matter suspects "These repetitive bursts are also likely associated with gravitational waves that ESA's future mission LISA (Laser Interferometer Space Antenna) might be able to catch," Quintin added, referring to the joint ESA/NASA space-based gravitational wave detector set to launch in 2037. "It's crucial to have these X-ray observations that will complement the gravitational wave data and help us solve the puzzling behaviour of massive black holes." The team's research was published on Friday (March 11) in the journal Nature Astronomy.
