Английская Википедия:IC 2497
Шаблон:Short description Шаблон:Infobox galaxy IC 2497 is a spiral galaxy[1] close to the intergalactic cloud Hanny's Voorwerp.[2] The galaxy is a former quasar, whose light lit up Hanny's Voorwerp, which is now a light echo of that extinct quasar.[3] It is about Шаблон:Convert away from Hanny's Voorwerp.[4] The quasar shut down sometime in the last 70,000 years.[5] This revises current theories of quasar operation, as the quasar is quiescent, shutting down much faster than was thought possible,[6] and is much cooler than predicted.[4] The galaxy is currently 100 to 10,000 times dimmer than it was when its quasar burned into Hanny's Voorwerp.[7]
One supernova has been observed in IC 2497: SN 2020ilb (type Ia, mag. 19) was discovered on 29 April 2020.[8]
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