Phoenix dwarf galaxy
Galaxy Phoenix dwarf galaxy |
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The Phoenix dwarf galaxy imaged using the FORS2 instrument on the Very Large Telescope | |
AladinLite | |
Constellation | Phoenix |
Position equinox : J2000.0 , epoch : J2000.0 |
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Right ascension | 01 h 51 m 06.3 s |
declination | -44 ° 26 ′ 41 ″ |
Appearance | |
Morphological type | dIAm |
Brightness (visual) | 13.1 mag |
Angular expansion | 4.9 ′ × 4.1 ′ |
Physical data | |
Affiliation | Local group |
Radial velocity | (60 ± 30) km / s |
distance | (1,440,000 ± 70,000) Lj / (440,000 ± 20,000) pc |
history | |
discovery | Hans-Emil Schuster , Richard Martin West |
Discovery date | 1976 |
Catalog names | |
PGC 6830 • ESO 245-G7 • SGC 014903-4441.5 • AM 0149-444 |
The Phoenix dwarf galaxy is an irregular dwarf galaxy in the constellation of the Phoenix , which was discovered by Hans-Emil Schuster and Richard Martin West in 1976 and was initially mistaken for a globular cluster . It is located about 0.44 M pc from Earth and belongs to the Local Group .
properties
The Phoenix dwarf galaxy has a star population of young stars in its central region , which move in an east-west direction and a population of mainly older stars in the outer regions of the galaxy , which move in a north-south direction. The star formation rate in the central region seems to be relatively stable throughout the evolution of the dwarf galaxy (Martínez-Delgado et al. 1999). In 1999 , St-Germain et al. an HI area of about 10 5 M ☉ directly west of the Phoenix dwarf galaxy. Its radial velocity is around −23 km / s and probably shows a gravitational coupling with the dwarf galaxy.
additional
Web links
- ESO: An Explosive Phoenix September 17, 2018
Individual evidence
- ↑ a b c d e f NASA / IPAC Extragalactic Database
- ↑ ID Karachentsev, VE Karachentseva, WK Hutch Meier, DI Makarov: A Catalog of Neighboring Galaxies . In: Astronomical Journal . 127, No. 4, 2004, pp. 2031-2068. bibcode : 2004AJ .... 127.2031K . doi : 10.1086 / 382905 .
- ↑ Karachentsev, ID; Kashibadze, OG: Masses of the local group and of the M81 group estimated from distortions in the local velocity field . In: Astrophysics . 49, No. 1, 2006, pp. 3-18. bibcode : 2006Ap ..... 49 .... 3K . doi : 10.1007 / s10511-006-0002-6 .
- ↑ H.-E. Schuster, RM West: A very distant globular cluster? . In: Astronomy and Astrophysics . 49, 05/1976, pp. 129-131. bibcode : 1976A & A .... 49..129S .
- ↑ R. Canterna, PJ Flower: A new dwarf irregular galaxy in the constellation Phoenix . In: Astrophysical Journal . 212, No. Letters, March 1977, pp. L57-L58. bibcode : 1977ApJ ... 212L..57C . doi : 10.1086 / 182374 .
- ^ Sidney van den Bergh: Updated Information on the Local Group . In: The Publications of the Astronomical Society of the Pacific . 112, No. 770, April 2000, pp. 529-536. arxiv : astro-ph / 0001040 . bibcode : 2000PASP..112..529V . doi : 10.1086 / 316548 .