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Leo II (dwarf galaxy)

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Title: Leo II (dwarf galaxy)  
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Leo II (dwarf galaxy)

Leo II
Observation data (J2000 epoch)
Constellation Leo
Right ascension 11h 13m 29.2s [1]
Declination +22° 09′ 17″ [1]
Redshift 0.000264 (79 ± 1 km/s) [1]
Distance

690 ± 70 kly (210 ± 20 kpc)[2]

[3]
Type E0 pec [1]
Apparent dimensions (V) 12.0 x 11.0 arcmin [1]
Apparent magnitude (V) 12.6 [1]
Other designations
PGC 34176, DDO 93

Leo II (or Leo B) is a Mount Wilson and Palomar Observatories in California.

Recent Findings

In 2007 a team of 15 scientists observed Leo II through the 8.2 meter Subaru optical-infrared telescope in Mauna Kea, Hawaii. Over 2 nights, 90 minutes of exposures were taken and 82,252 stars were detected down to a visible magnitude of 26. They found that Leo II consists largely of metal-poor older stars, a sign that it has survived the galactic cannibalism under which massive galaxies (e.g., the Milky Way) consume smaller galaxies to attain their extensive size.[6]

Observation at ESO estimates Leo II's mass to be (2.7 ± 0.5)×107 M.[7]

See also

References

  1. ^ a b c d e f "NASA/IPAC Extragalactic Database". Results for Leo B. Retrieved 2006-11-18. 
  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.  
  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.  arXiv:0708.1853
  4. ^ Tollerud, E.; et al. (Nov 2008). "Hundreds of Milky Way Satellites? Luminosity Bias in the Satellite Luminosity Function". Astrophysical Journal 688 (1): 277–289.  
  5. ^ Coleman, M.; et al. (Nov 2007). "A Wide-Field View of Leo II: A Structural Analysis Using the Sloan Digital Sky Survey". Astronomical Journal 134 (5): 1938–1951.  
  6. ^ "Leo II: An Old Dwarf Galaxy with Juvenescent Heart". National Astronomical Observatory of Japan. 28 Nov 2007. Retrieved 25 Nov 2008. 
  7. ^ Andreas Koch; et al. (August 2007). "Stellar Kinematics in the Remote Leo II Dwarf Spheroidal Galaxy—Another Brick in the Wall". Astronomical Journal 134 (2): 566–578.  
  • Harrington R. G.; Wilson A. G. (1950). "Two New Stellar Systems in Leo".  

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