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There are actually much fewer supernovae speculated



Wrong identity: hypothetical supernovas are actually far fewer

Image source: Carnegie Institute of Science

In the case of a manga’s wrong identity, an international team of astronomers revealed that they once thought it was a supernova, but actually erupted periodically from a galaxy. A supermassive black hole in the galaxy released an energy burst every 1

14 days. Because it tore most of the track. star.

Six years after Carnegie’s Thomas Holoien first discovered it in The Astronomical Appliances, researchers led by Anna Payne of the University of Hawaii at Manaya can now say that they observe This phenomenon is called ASASSN-14ko, and it is a periodic phenomenon that constantly appears at the center of the Milky Way galaxy about 570 million light-years away to the south.

Their findings (based on 20 regular outbreaks) will be published in Astrophysical Journal It was proposed by Payne at the annual meeting of the American Astronomical Society.

Active galaxies, such as the host of ASASSN-14ko, have unusually bright and variable centers. The energy produced by these objects is much greater than the total contribution of all their stars. Astrophysicists believe that this is due to gravity and friction heating the gas and dust vortex that accumulates around the central supermassive black hole. Black holes consume material slowly, causing low-level random changes in the light emitted by the disk.

This is the first clear example of such clockwork in an active galaxy. Periodically recurring flares, such as those produced by ASASSN-14ko, may be evidence of the elusive cosmic phenomena previously predicted by theorists.

Payne said: “After knowing the schedule of this old galaxy show, we can carry out more detailed coordination and research.”

ASASSN-14ko was detected for the first time by the All Weather Automated Supernova Survey (ASAS-SN), a global network of 20 robotic telescopes headquartered at Ohio State University (OSU) in Columbus. When Payne checked all ASAS-SN data about the phenomenon, she noticed a series of 17 regularly spaced flares.






Based on this discovery, astronomers predict that the galaxy will erupt again on May 17 last year and coordinate ground and space facilities for observation. Since then, they successfully predicted and witnessed the flares on September 7 and December 26.

“ASAS-SN aims to detect the physics of our universe by looking for transient and variable events.” Hollown said. “What’s exciting is that the luminous object we initially thought was a violent supernova explosion. It is interesting in itself, but it is more common, and the result is a long-awaited cosmic event.”

So, what causes the recurring flares? The research team considered several possible explanations, but believes that the most likely is the so-called partial tidal destruction event.

When a star is too close to a supermassive black hole, a tidal rupture event or TDE will occur, which tears the black hole into pieces. Some of its matter was thrown into space, and the rest fell back into the black hole, forming a hot, bright gas when consumed.

In this case, instead of eliminating the star in the interaction of the black hole, it is better to peel it off slowly in each orbit. When the missing material (mass equal to three times the mass of Jupiter) falls into a black hole, a flare occurs.

Astronomers are not sure how long the flare will last. A star cannot lose mass forever. Although scientists can estimate the mass it loses in each orbit, they don’t know how much mass it initially had.

Benjamin Shappee, the second author of UHMānoa (and Carnegie alumnus), said: “We plan or continue to predict and observe these outbreaks for as long as possible.” “This rare discovery may reveal information about black hole physics. New details.”


NASA mission helps to investigate “Old Faithful” active galaxies


More information:
ASASSN-14ko is the periodic nuclear transient in ESO 253-G003. arXiv: 2009.03321 [astro-ph.HE] arxiv.org/abs/2009.03321

Provided by the Carnegie Institute of Science



Citation: Wrong identity: The supposed supernova is actually much less (January 13, 2021), it is January 13, 2021 from https://phys.org/news/2021-01-mistaken-identity -presumed-supernova-rarer.html retrieved

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