Astronomy:Carina Dwarf Spheroidal Galaxy

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Short description: Dwarf galaxy in the constellation Carina
Carina Dwarf Spheroidal Galaxy
Carina Dwarf Galaxy.jpg
Carina Dwarf Spheroidal Galaxy image made using observations from the Wide Field Imager on the MPG/ESO 2.2-metre telescope at La Silla, and from the Victor M. Blanco 4-metre telescope at the Cerro Tololo Inter-American Observatory.
Observation data (J2000 epoch)
ConstellationCarina
Right ascension 06h 41m 36.7s[1]
Declination−50° 57′ 58″[1]
Redshift230 ± 60 km/s[1]
Distance330 ± 30 kly (100 ± 10 kpc)[2][3]
Apparent magnitude (V)11.3B[1]
Characteristics
TypeE3[1]
Mass1.51-1.69 × 106[4] M☉
Apparent size (V)23.4′ × 15.5′[1]
Notable features-
Other designations
Carina Dwarf,[1] PGC 19441,[1] ESO 206-G20
The location of the Carina Dwarf Spheriodal Galaxy (circled in red)

The Carina Dwarf Spheroidal Galaxy is a dwarf galaxy in the Carina constellation. It was discovered in 1977 with the UK Schmidt Telescope by Cannon et al.[5][6] The Carina Dwarf Spheroidal galaxy is a satellite galaxy of the Milky Way and is receding from it at 230 km/s.[1] The diameter of the galaxy is about 1600 light-years, which is 75 times smaller than the Milky Way.[7] Most of the stars in the galaxy formed 7 billion years ago,[8] although it also experienced bursts of star formation about 13 and 3 billion years ago.[9] It is also being tidally disrupted by the Milky Way galaxy.[10]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "NASA/IPAC Extragalactic Database". Results for Carina Dwarf Spheroidal. http://nedwww.ipac.caltech.edu/. 
  2. ↑ I. D. Karachentsev; V. E. Karachentseva; W. K. Hutchmeier; D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal 127 (4): 2031–2068. doi:10.1086/382905. Bibcode: 2004AJ....127.2031K. 
  3. ↑ Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics 49 (1): 3–18. doi:10.1007/s10511-006-0002-6. Bibcode: 2006Ap.....49....3K. 
  4. ↑ F. A. Santana; R. R. Munoz; T. J. L. de Boer; J. D. Simon; M. Geha; P. Cote; A. E. Guzman; P. Stetson et al. (2016). "A MegaCam Survey of Outer Halo Satellites. VI. The Spatially Resolved Star-formation History of the Carina Dwarf Spheroidal Galaxy". Astrophysical Journal 829 (2): 86. doi:10.3847/0004-637X/829/2/86. Bibcode: 2016ApJ...829...86S. 
  5. ↑ "Carina Dwarf". http://spider.seds.org/spider/LG/car_dw.html. 
  6. ↑ R. D. Cannon; T. G. Hawarden; S. B. Tritton (1977). "A new Sculptor-type dwarf elliptical galaxy in Carina". Monthly Notices of the Royal Astronomical Society 180: 81–82. doi:10.1093/mnras/180.1.81p. Bibcode: 1977MNRAS.180P..81C. 
  7. ↑ Steve Phillipps (2004). "Small galaxies are growing smaller". Astronomy & Geophysics 45 (6): 6.6-6.9. doi:10.1046/j.1468-4004.2003.45606.x. Bibcode: 2004A&G....45f...6P. 
  8. ↑ The Satellite Galaxies
  9. ↑ Hurley-Keller, Dennise; Mateo, Mario; Nemec, James (1998). "The Star Formation History of the Carina Dwarf Galaxy". The Astronomical Journal 115 (5): 1840–1855. doi:10.1086/300326. Bibcode: 1998AJ....115.1840H. 
  10. ↑ Kuhn, J. R.; Smith, Horace A.; Hawley, Suzanne L. (1996). "Tidal Disruption and Tails from the Carina Dwarf Spheroidal Galaxy". The Astrophysical Journal 469 (2): L93–L96. doi:10.1086/310270. Bibcode: 1996ApJ...469L..93K. 

External links


Coordinates: Sky map 06h 41m 36.7s, −50° 57′ 58″



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