Astronomy:IC 2497
| IC 2497 | |
|---|---|
 | |
| Observation data (J2000.0[1] epoch) | |
| Constellation | Leo Minor [2] |
| Right ascension | 09h 41m 04.076s [1] |
| Declination | +34° 43′ 58.57″ [1] |
| Redshift | 0.051633 [1] |
| Distance | 650 Mly (199.29 Mpc) |
| Characteristics | |
| Apparent size (V) | 0.390' × 0.320' [1] |
IC 2497 is a spiral galaxy[3] close to the intergalactic cloud Hanny's Voorwerp.[1] The galaxy is a former quasar, whose light lit up Hanny's Voorwerp, which is now a light echo of that extinct quasar.[4] It is about 45,000–70,000 light-years (14,000–21,000 pc) away from Hanny's Voorwerp.[5] The quasar shut down sometime in the last 70,000 years.[6] This revises current theories of quasar operation, as the quasar is quiescent, shutting down much faster than was thought possible,[7] and is much cooler than predicted.[5] The galaxy is currently 100 to 10,000 times dimmer than it was when its quasar burned into Hanny's Voorwerp.[8]
One supernova has been observed in IC 2497: SN 2020ilb (type Ia, mag. 19) was discovered on 29 April 2020.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "IC 2497". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=IC+2497.
- ↑ Davide De Martin (2007). "IC 2497". Sky Factory. http://www.skyfactory.org/deepskycatalogue/IC2497.html.
- ↑ Paul Rincon (5 August 2008). "Teacher finds new cosmic object". BBC News. http://news.bbc.co.uk/2/hi/science/nature/7543776.stm.
- ↑ "Cosmic Curiosity Reveals Ghostly Glow of Dead Quasar". ScienceDaily. 6 November 2010. https://www.sciencedaily.com/releases/2010/11/101103171638.htm.
- ↑ 5.0 5.1 Tudor Vieru (3 November 2010). "Shut Down Quasar Found Close By". Softpedia. http://news.softpedia.com/news/Shut-Down-Quasar-Found-Close-By-164389.shtml.
- ↑ Jon Voisey (3 November 2010). "What Hanny's Voorwerp Reveals About Quasar Deaths". Universe Today. http://www.universetoday.com/77280/what-hannys-voorwerp-reveals-about-quasar-deaths/.
- ↑ "Cosmic Curiosity Reveals Ghostly Glow of Dead Quasar". ECN Magazine. Yale University. 3 November 2010. http://www.ecnmag.com/News/2010/11/Cosmic-Curiosity-Reveals-Ghostly-Glow-of-Dead-Quasar/.
- ↑ Lisa Grossman (2 November 2010). "Rare Dead Quasar Found in Nearby Galaxy". Wired. https://www.wired.com/wiredscience/2010/11/quasar-shutdown/. Retrieved 2010-11-11.
- ↑ 2020ilb Transient Name Server entry for SN SN 2020ilb. Retrieved 26 March 2023.
Further reading
- Schawinski, K. (2010). "The Sudden Death of the Nearest Quasar". The Astrophysical Journal Letters 724 (1): L30–L33. doi:10.1088/2041-8205/724/1/L30. Bibcode: 2010ApJ...724L..30S.
- Rampadarath, H. (2010). "Hanny's Voorwerp". Astronomy and Astrophysics 517: L8. doi:10.1051/0004-6361/201014782. Bibcode: 2010A&A...517L...8R.
- Józsa, G. I. G. (2009). "Revealing Hanny's Voorwerp: Radio observations of IC 2497". Astronomy and Astrophysics 500 (2): L33–L36. doi:10.1051/0004-6361/200912402. Bibcode: 2009A&A...500L..33J.
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