Astronomy:Andromeda XVIII
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Short description: Galaxy in constellation Andromeda
| Andromeda XVIII | |
|---|---|
 DSS image of Andromeda XVIII | |
| Observation data (J2000 epoch) | |
| Constellation | Andromeda |
| Right ascension | 00h 02m 14.5s[1] |
| Declination | +45° 05′ 20″[1] |
| Helio radial velocity | −326.2 ± 2.7[2] |
| Distance | 4,420 ± 290 kly (1,355 ± 88 kpc) |
| Group or cluster | Local Group |
| Apparent magnitude (V) | 15.50 ± 0.24[3] |
| Absolute magnitude (V) | −10.41 ± 0.28[3] |
| Characteristics | |
| Type | dG[1] |
| Mass | 4.2×106 ± 0.3×106[3] M☉ |
| Half-light radius (physical) | 325 ± 24[2] |
| Other designations | |
| PGC 5056918[4] | |
Andromeda XVIII, discovered in 2008, is a dwarf spheroidal galaxy (has no rings, low luminosity, much dark matter, little gas or dust), which is a satellite of the Andromeda Galaxy (M31). It is one of the 14 known dwarf galaxies orbiting M31. It was announced in 2010 that the orbiting galaxies lie close to a plane running through M31's center.[citation needed]
See also
References
- ↑ 1.0 1.1 1.2 McConnachie, Alan W; Huxor, Avon; Martin, Nicolas F; Irwin, Mike J; Chapman, Scott C; Fahlman, Gregory; Ferguson, Annette M. N; Ibata, Rodrigo A et al. (2008). "A Trio of New Local Group Galaxies with Extreme Properties". The Astrophysical Journal 688 (2): 1009. doi:10.1086/591313. Bibcode: 2008ApJ...688.1009M.
- ↑ 2.0 2.1 Collins, Michelle L. M; Chapman, Scott C; Rich, R. Michael; Ibata, Rodrigo A; Martin, Nicolas F; Irwin, Michael J; Bate, Nicholas F; Lewis, Geraint F et al. (2013). "A Kinematic Study of the Andromeda Dwarf Spheroidal System". The Astrophysical Journal 768 (2): 172. doi:10.1088/0004-637X/768/2/172. Bibcode: 2013ApJ...768..172C.
- ↑ 3.0 3.1 3.2 Makarova, L. N; Makarov, D. I; Karachentsev, I. D; Tully, R. B; Rizzi, L (2017). "Star formation history of And XVIII: a dwarf spheroidal galaxy in isolation". Monthly Notices of the Royal Astronomical Society 464 (2): 2281. doi:10.1093/mnras/stw2502. Bibcode: 2017MNRAS.464.2281M.
- ↑ "NAME Andromeda XVIII". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+Andromeda+XVIII.
| Location | Andromeda Galaxy → Andromeda subgroup → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Observable universe → Universe Each → may be read as "within" or "part of". | .jpg) |
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*It is uncertain whether it is a companion galaxy of the Andromeda Galaxy | |
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