Phoenix dwarf galaxy

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Galaxy
Phoenix dwarf galaxy
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The Phoenix dwarf galaxy imaged using the FORS2 instrument on the Very Large Telescope
The Phoenix dwarf galaxy imaged using the FORS2 instrument on the Very Large Telescope
AladinLite
Constellation Phoenix
Position
equinox :  J2000.0 , epoch : J2000.0
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

Commons : Phoenix constellation  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d e f NASA / IPAC Extragalactic Database
  2. ↑ 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 .
  3. ↑ 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 .
  4. ↑ 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 .
  5. ↑ 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 .
  6. ^ 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 .