IC 2497 is a
spiral galaxy
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work ''The Realm of the Nebulae''[Hanny's Voorwerp
, (Dutch for ''Hanny's object'') is a rare type of astronomical object called a quasar ionization echo. It was discovered in 2007 by Dutch schoolteacher Hanny van Arkel while she was participating as a volunteer in the Galaxy Zoo project, part ...]
.
The galaxy is a former
quasar
A quasar is an extremely Luminosity, luminous active galactic nucleus (AGN). It is pronounced , and sometimes known as a quasi-stellar object, abbreviated QSO. This emission from a galaxy nucleus is powered by a supermassive black hole with a m ...
, whose light lit up Hanny's Voorwerp, which is now a light echo of that extinct quasar.
It is about away from Hanny's Voorwerp.
The quasar shut down sometime in the last 70,000 years.
This revises current theories of quasar operation, as the quasar is quiescent, shutting down much faster than was thought possible,
and is much cooler than predicted.
[ The galaxy is currently 100 to 10,000 times dimmer than it was when its quasar burned into Hanny's Voorwerp.]supernova
A supernova is a powerful and luminous explosion of a star. It has the plural form supernovae or supernovas, and is abbreviated SN or SNe. This transient astronomical event occurs during the last evolutionary stages of a massive star or when ...
has been observed in IC 2497: SN 2020ilb ( type Ia, mag. 19) was discovered on 29 April 2020.2020ilb Transient Name Server entry for SN SN 2020ilb.
Retrieved 26 March 2023.
References
Further reading
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External links
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{{DEFAULTSORT:IC 2497
Leo Minor
Spiral galaxies
2497
165538
09380+3457