| Revision as of 06:02, 14 August 2013 editSandover (talk | contribs)4,157 edits discovered by Valentina Karachentseva← Previous edit | Revision as of 17:18, 21 September 2013 edit undo69.153.135.18 (talk) →HistoryTag: Visual editNext edit → | ||
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| ==History== | ==History== | ||
| It was discovered |
It was discovered | ||
| ] in 1976.<ref name="McConnachieetal2005" /> | |||
| ==Star Formation History== | ==Star Formation History== | ||
Revision as of 17:18, 21 September 2013
| Pisces Dwarf | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Constellation | Pisces |
| Right ascension | 01 03 55.0 |
| Declination | +21° 53′ 06″ |
| Redshift | -287 ± 0 km/s |
| Distance | 2.51 ± 0.08 Mly (769 ± 25 kpc) |
| Apparent magnitude (V) | 14.2 |
| Characteristics | |
| Type | dIrr/dSph |
| Apparent size (V) | 2′ × 2′ |
| Other designations | |
| LGS 3, PGC 3792 | |
Pisces Dwarf is an irregular dwarf galaxy that is part of the Local Group. The galaxy is also suspected of being a satellite galaxy of the Triangulum Galaxy (M33). Because it is in the constellation Pisces, the galaxy is called the Pisces Dwarf. It displays a blueshift, as it is approaching the Milky Way at 287 km/s. It may be transition-type galaxy, somewhere between dwarf spheroidal and dwarf irregular. Alternatively, it may be a rare, but statistically acceptable, version of one of the two types.
History
It was discovered
Valentina Karachentseva in 1976.
Star Formation History
A study of the star formation history conducted by Miller et al. 2001 provide much information on how this galaxy developed. Apparently, the star formation rate in the Pisces Dwarf has been declining for the past 10 billion years. Most of the galaxy's stars were formed in its early years, about 8 billion years ago. The Miller study has also shown that there has been no significant star formation for the past 100 million years. Hence, most of the stars that populate this galaxy are old, metal-rich stars aged about 2.5 billion years. But there are small clusters of young, hot, blue stars on the outer areas of the galaxy.
References
- ^ "NASA/IPAC Extragalactic Database". Results for Pisces Dwarf. Retrieved 2007-03-15.
- ^ 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. arXiv:astro-ph/0410489. Bibcode:2005MNRAS.356..979M. doi:10.1111/j.1365-2966.2004.08514.x.
{{cite journal}}: CS1 maint: multiple names: authors list (link)
| Triangulum Galaxy | ||
|---|---|---|
| Location | Triangulum Galaxy → Triangulum subgroup →
Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Local Hole → Observable universe → Universe Each arrow (→) may be read as "within" or "part of". |  |
| H II regions | ||
| Suspected satellite galaxies | ||
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