Spinning black hole swallows star; surpasses all supernovae in brightness (Synopsis) [Starts With A Bang]

“Even with all the collected data we cannot say with 100% certainty that the ASASSN-15lh event was a tidal disruption event. But it is by far the most likely explanation.” -Giorgos Leloudas

Last year, a record-shattering event occurred: we saw the brightest supernova ever observed in the Universe. It outshone the previous record holder by more than double, and it reached a peak brightness of more than 20 times the sum total of all the stars in the Milky Way galaxy. Surprisingly, it occurred in a red, quiet galaxy, rather than the bright blue ones famous for them. After 10 months of follow-up observations, it looks like it wasn’t a supernova after all.

The increase in temperature (top graph) and the re-brightening (bottom) when all other supernovae fail to show these features indicate that tidal disruption, not core collapse, is likely at play here. Image credit: G. Leloudas et al., Nature Astronomy 1, Article number: 0002 (2016).

Instead of fading away, there was a rebrightening months after the peak. Instead of cooling down, something reheated the glow to even greater temperatures. The only thing that fits the data? A tidal disruption event, and even those would only work if it were a supermassive black hole that rotated more quickly than any such event ever observed before.

This artist’s impression depicts a rapidly spinning supermassive black hole surrounded by an accretion disc. A tidally disrupted star may be responsible for the matter, and for the luminous emissions that result. Image credit: ESA/Hubble, ESO, M. Kornmesser.

Come get the full spectacular story — and the science behind it — as we finally learn where the brightest event in history came from!

from ScienceBlogs http://ift.tt/2hraiak

“Even with all the collected data we cannot say with 100% certainty that the ASASSN-15lh event was a tidal disruption event. But it is by far the most likely explanation.” -Giorgos Leloudas

Last year, a record-shattering event occurred: we saw the brightest supernova ever observed in the Universe. It outshone the previous record holder by more than double, and it reached a peak brightness of more than 20 times the sum total of all the stars in the Milky Way galaxy. Surprisingly, it occurred in a red, quiet galaxy, rather than the bright blue ones famous for them. After 10 months of follow-up observations, it looks like it wasn’t a supernova after all.

The increase in temperature (top graph) and the re-brightening (bottom) when all other supernovae fail to show these features indicate that tidal disruption, not core collapse, is likely at play here. Image credit: G. Leloudas et al., Nature Astronomy 1, Article number: 0002 (2016).

Instead of fading away, there was a rebrightening months after the peak. Instead of cooling down, something reheated the glow to even greater temperatures. The only thing that fits the data? A tidal disruption event, and even those would only work if it were a supermassive black hole that rotated more quickly than any such event ever observed before.

This artist’s impression depicts a rapidly spinning supermassive black hole surrounded by an accretion disc. A tidally disrupted star may be responsible for the matter, and for the luminous emissions that result. Image credit: ESA/Hubble, ESO, M. Kornmesser.

Come get the full spectacular story — and the science behind it — as we finally learn where the brightest event in history came from!

from ScienceBlogs http://ift.tt/2hraiak