Virgo I is an extremely faint satellite galaxy of the Milky Way.[2] It was discovered in the Subaru Strategic Survey. Virgo I has an absolute visual magnitude of −0.8 making it one of the least luminous galaxies confirmed thus far. The galaxy has a radius of 124 light years, (half light radius 38 pc) meaning that it is too big to be a globular cluster.[2] Cetus II is dimmer, but too small to be classed as a galaxy.[2] Virgo I is dimmer than Segue I, the previous dimmest known. The distance to Virgo I is 87 kiloparsecs (280,000 ly).[1]
| Virgo I | |
|---|---|
| Observation data (J2000 epoch) | |
| Constellation | Virgo |
| Right ascension | 12h 00m 09.6s[1] |
| Declination | −00° 40′ 48″[1] |
| Distance | 280+42 −26 kly (87 +13 −8 kpc)[1] |
| Absolute magnitude (V) | −0.8 ± 0.9[1] |
| Characteristics | |
| Type | dSph[1] |
| Half-light radius (physical) | 38+12 −11 pc[1] |
| Half-light radius (apparent) | 1.5′[1] |
| Other designations | |
| Virgo I | |
References
edit- ^ a b c d e f g h Homma, Daisuke; Chiba, Masashi; Okamoto, Sakurako; Komiyama, Yutaka; Tanaka, Masayuki; Tanaka, Mikito; Ishigaki, Miho N.; Akiyama, Masayuki; Arimoto, Nobuo; Garmilla, José A.; Lupton, Robert H.; Strauss, Michael A.; Furusawa, Hisanori; Miyazaki, Satoshi; Murayama, Hitoshi; Nishizawa, Atsushi J.; Takada, Masahiro; Usuda, Tomonori; Wang, Shiang-Yu (14 November 2016). "A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey". The Astrophysical Journal. 832 (1): 21. arXiv:1609.04346. Bibcode:2016ApJ...832...21H. doi:10.3847/0004-637X/832/1/21. S2CID 118700037.
- ^ a b c "Record-breaking faint satellite galaxy of the Milky Way discovered". PhysOrg. 22 November 2016. Retrieved 24 November 2016.
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