Pegasus Dwarf Irregular Galaxy
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| Observation data: J2000 epoch | |
|---|---|
| Constellation: | Pegasus |
| Right ascension: | 23h 28m 36.2s[1] |
| Declination: | +14° 44′ 35″[1] |
| Redshift: | -183 ± 0 km/s[1] |
| Distance: | 3.0 ± 0.1 Mly (920 ± 30 kpc)[2] |
| Type: | dIrr/dSph[1][a] |
| Apparent dimensions (V): | 5′.0 × 2′.7[1] |
| Apparent magnitude (V): | 13.2[1] |
| Notable features: | |
| Other designations | |
| UGC 12613,[1] PGC 71538,[1] DDO 216,[1] |
|
| See also: Galaxy, List of galaxies | |
The Pegasus Dwarf Irregular Galaxy (also known as Peg DIG or the Pegasus Dwarf) is an irregular galaxy and a dwarf galaxy in the direction of the constellation Pegasus. It was discovered by A.G. Wilson in the 1950s. The Pegasus Dwarf is a companion of the Andromeda Galaxy in the Local Group.
Contents |
[edit] General information
The Pegasus Dwarf is a galaxy with mainly metal-poor stellar populations.[citation needed]
In 1975 Tully & Fischer determined that it was part of the Local Group.[citation needed] The metallicity and the related distance estimate has been subject to discussions in the scientific literature, with varying results, however, recently, by use of the tip of the red giant branch, a distance within 10% error was achieved in 2000[3][4] and then improved to 3% in 2005.[2]
[edit] See also
- Pegasus Dwarf Spheroidal Galaxy (Peg dSph)
- Pegasus galaxy, the Stargate Atlantis fictional location.
[edit] Notes
[edit] References
- ^ a b c d e f g h i j k NASA/IPAC Extragalactic Database. Results for PegDIG. Retrieved on March 15, 2007.
- ^ a b McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.; Ibata, R. A.; Lewis, G. F.; Tanvir, N. (2005). "Distances and metallicities for 17 Local Group galaxies". Monthly Notices of the Royal Astronomical Society 356 (4): 979-997.
- ^ Karachentsev, Igor D.; Karachentseva, Valentina E.; Huchtmeier, Walter K.; Makarov, Dmitry I. (2004). "A Catalog of Neighboring Galaxies". The Astronomical Journal 127 (4): 2031-2068.
- ^ van den Bergh, Sidney (2000). The Galaxies of the Local Group. Cambridge, UK: Cambridge University Press. ISBN 0521651816.
- ^ Cole, Andrew A.; Tolstoy, Eline; Gallagher, John S., III; Hoessel, John G.; Mould, Jeremy R.; Holtzman, Jon A.; Saha, Abhijit; Ballester, Gilda E.; Burrows, Christopher J.; Clarke, John T.; Crisp, David; Griffiths, Richard E.; Grillmair, Carl J.; Hester, Jeff J.; Krist, John E.; Meadows, Vikki; Scowen, Paul A.; Stapelfeldt, Karl R.; Trauger, John T.; Watson, Alan M.; Westphal, James R. (1999). "Stellar Populations at the Center of IC 1613". The Astronomical Journal 118 (4): 1657-1670.
