Andromeda XXII
| Andromeda XXII | |
|---|---|
| Observation data (J2000 epoch) | |
| Constellation | Pisces |
| Right ascension | 01h 27m 40s[1] [2] |
| Declination | +28° 05′ 25″[1] [2] |
| Distance | 940–1,033 kiloparsecs (3.07×ばつ10 |
| Apparent magnitude (V) | 18.0[2] |
| Characteristics | |
| Type | dSph |
| Notable features | Satellite galaxy of Triangulum |
| Other designations | |
| Andromeda XXII, And XXII, And 22, Pisces VI, Psc VI, Triangulum I, Tri I [3] | |
Andromeda XXII (Pisces VI, Triangulum I) is a low surface brightness dwarf spheroidal galaxy about 940–1,033 kiloparsecs (3.07×ばつ10(削除) ^ (削除ここまで)6–3.37×ばつ10(削除) ^ (削除ここまで)6 ly) away from the Sun in the constellation Pisces, of the Local Group.
Andromeda XXII is located much closer in projection to M33 than M31 [42 kiloparsecs (140×ばつ10(削除) ^ (削除ここまで)3 ly) vs. 224 kiloparsecs (730×ばつ10(削除) ^ (削除ここまで)3 ly)]. This fact suggests that it might be the first Triangulum (M33) satellite ever discovered. However, it is currently catalogued as a satellite of Andromeda (M31).[3]
The discovery arose from the first year data of a photometric survey of the M31/M33 subgrouping of the Local Group by the Pan-Andromeda Archaeological Survey (PAndAS). This survey was conducted with the Megaprime/MegaCam wide-field camera mounted on the Canada-France-Hawaii Telescope.
See also
[edit ]- Low surface brightness galaxy (LSB galaxy)
- Dwarf spheroidal galaxy (dSph)
- Satellite galaxy
- Triangulum Galaxy
- Andromeda Galaxy
- Pisces constellation
References
[edit ]- ^ a b Deep Sky Observer's Companion, Andromeda XXII (accessed 2 April 2011)
- ^ a b c "NAME Andromeda XXII". SIMBAD . Centre de données astronomiques de Strasbourg.
- ^ a b c Nicolas F. Martin, Alan W. McConnachie, Mike Irwin, Lawrence M. Widrow, Annette M. N. Ferguson, Rodrigo A. Ibata, John Dubinski, Arif Babul, Scott Chapman, Mark Fardal, Geraint F. Lewis, Julio Navarro, R. Michael Rich; "PAndAS' cubs: discovery of two new dwarf galaxies in the surroundings of the Andromeda and Triangulum galaxies"; The Astrophysical Journal, Volume 705, Issue 1, pp. 758-765 (2009); doi:10.1088/0004-637X/705/1/758; Bibcode:2009ApJ...705..758M; arXiv:0909.0399 ;
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