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Tidal Disruption Events

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Astronomers catch a rare middleweight black hole shredding a star
astronomy1 month ago

Astronomers catch a rare middleweight black hole shredding a star

Astronomers identified AT2022zod, an off-nuclear optical flare consistent with a tidal disruption event caused by an intermediate-mass black hole. Spotted in a distant galaxy about 1.5 billion light-years away and lasting roughly a month, its off-center location and short duration suggest the presence of an IMBH outside galactic centers, possibly in a globular cluster or ultracompact dwarf galaxy. This finding adds to evidence for elusive middleweight black holes and points to Rubin Observatory’s LSST as a key tool for discovering more cases.

via Space|
#astronomy#at2022zod#globular-cluster
Black Holes Cause Bright Blue Cosmic Flashes, Scientists Confirm
science3 months ago

Black Holes Cause Bright Blue Cosmic Flashes, Scientists Confirm

Scientists have identified that the brightest blue cosmic explosions, known as LFBOTs, are caused by black holes shredding stars in extreme Tidal Disruption Events, with the recent discovery of AT 2024wpp providing strong evidence that these events are far more energetic than typical supernovae and involve black holes feeding on companion stars, resulting in powerful high-energy emissions.

via Space|
#at-2024wpp#black-holes#cosmic-blasts
Star Survives Black Hole Encounter and Returns
science8 months ago

Star Survives Black Hole Encounter and Returns

A star has been observed escaping a supermassive black hole and returning for a second encounter, challenging previous understanding of tidal disruption events and suggesting some black holes may partially consume stars rather than fully destroy them. The discovery raises questions about the nature of these flares and whether stars can survive multiple close encounters with black holes, potentially rewriting theories about black hole-star interactions.

via Space|
#black-hole#cosmic-phenomena#flares
Astronomers Measure Supermassive Black Hole Spinning at Quarter Light Speed
science1 year ago

Astronomers Measure Supermassive Black Hole Spinning at Quarter Light Speed

Researchers have discovered that the "wobble" of an accretion disk formed from a star ripped apart by a supermassive black hole can reveal the black hole's spin speed. This wobble, caused by the Lense-Thirring effect, was observed using NASA's NICER X-ray telescope. The findings suggest that the black hole involved in the event was spinning slower than expected, at less than 25% the speed of light. Future observations, particularly with the upcoming Vera C. Rubin Observatory, could provide more insights into the spin distribution and evolution of supermassive black holes.

via Space.com|
#astronomy#black-holes#mit
"Unraveling the Mystery of Short Supermassive Black Hole Jets"
astronomy2 years ago

"Unraveling the Mystery of Short Supermassive Black Hole Jets"

Astronomers have discovered that "Compact Symmetric Objects" (CSOs) are active galaxies with short-lived jets that are the result of supermassive black holes ripping apart massive stars in tidal disruption events (TDEs). These jets have short lifetimes of 5,000 years or less and then fade away. The team also found that only 1% of CSOs will go on to have long-lived events with extended jets. This research provides new insights into the behavior of supermassive black holes and the formation of CSOs, shedding light on a previously overlooked population of galaxies.

via Space.com|
#astronomy#galaxies#jets
"Shredded Stars Briefly Awaken Sleeping Supermassive Black Holes"
astronomy2 years ago

"Shredded Stars Briefly Awaken Sleeping Supermassive Black Holes"

Astronomers have discovered that Compact Symmetric Objects (CSOs), a class of active galaxies hosting supermassive black holes, have relatively short lifespans of thousands of years, unlike other galaxies with longer-lived jets. These jets are likely fueled by tidal disruption events, where a single massive star is shredded by a supermassive black hole, leading to the formation of ultrafast bipolar jets that last up to 5,000 years. The study, led by a Caltech team, identified and verified 64 CSOs, shedding light on a distinct population of galaxies and providing a new avenue for studying interactions between massive stars and supermassive black holes.

via Phys.org|
#astronomy#compact-symmetric-objects#jets
"Discovery: Infrared Reveals Massive Black Hole Feeding Frenzy"
astronomy2 years ago

"Discovery: Infrared Reveals Massive Black Hole Feeding Frenzy"

An international team of researchers has discovered 18 previously hidden tidal disruption events (TDEs) where black holes tear apart stars, using infrared observations to penetrate dust-rich galaxies. These events, which were missed by optical and X-ray searches, provide new insights into TDE demographics and suggest that TDEs may be more common than previously thought. The findings also address the "missing energy" question and indicate that future surveys with infrared capabilities could reveal hundreds or even thousands of TDEs annually.

via Ars Technica|
#astronomy#black-holes#dusty-galaxies
"Discovery: 18 Black Holes Devouring Stars in Tidal Disruption Events"
astronomy2 years ago

"Discovery: 18 Black Holes Devouring Stars in Tidal Disruption Events"

Astronomers from MIT have discovered 18 new instances of black holes tearing apart and consuming stars, doubling the known number of such events in the local universe. These Tidal Disruption Events (TDEs) occur when a star gets too close to a black hole, resulting in the star being stretched and torn apart in a process called "spaghettification." The findings suggest that TDEs can occur in a wider range of galaxies than previously thought, and the team used infrared light and an algorithm to identify these events. The research also explains why TDEs were previously thought to occur only in specific types of galaxies and provides insights into the mechanics behind these cosmic phenomena.

via Space.com|
#astronomy#black-holes#galaxies
"Discovery: 18 Black Holes Devouring Nearby Stars"
astronomy2 years ago

"Discovery: 18 Black Holes Devouring Nearby Stars"

MIT scientists have discovered 18 new tidal disruption events (TDEs) by looking for infrared emissions, doubling the catalog of known TDEs in the universe. By using infrared observations, the team found TDEs in a range of galaxies, resolving previous puzzles and discrepancies in the study of these events. The findings suggest that black holes can devour stars in various types of galaxies and may help estimate the rate at which TDEs occur. This research was supported, in part, by NASA.

via MIT News|
#astronomy#astrophysical-journal#black-holes