Boötes Dwarf Galaxy
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| Boötes Dwarf Galaxy | |
| Observation data (J2000 epoch) | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 00m 06s[1] |
| Declination | +14° 30′ 00″ ± 15″[1] |
| Distance | 197 ± 18 kly (60 ± 6 kpc)[1] |
| Type | dSph[1] |
| Apparent dimensions (V) | 26′.0 ± 1′.4[1] |
| Apparent magnitude (V) | 13.1[a] |
| Other designations | |
| Boo dSph,[citation needed] Boötes Satellite,[2] Boötes Dwarf Spheroidal Galaxy,[2] Boötes dSph galaxy[2] |
|
| See also: Galaxy, List of galaxies | |
The Boötes Dwarf Galaxy (Boo dSph) is the faintest galaxy yet discovered,[citation needed] as of 2006, with a total luminosity of 100,000 Suns, and an absolute magnitude of -5.8. It lies about 197,000 light-years away in the Bootes constellation. This dwarf spheroidal galaxy appears to be tidally disrupted[1] by the Milky Way Galaxy which it orbits, and has two stellar trails that cross over to form a cross.[citation needed] Tidally disrupted galaxies usually only form one tail.[citation needed]
The galaxy is fainter than the next known faintest, the Ursa Major dwarf galaxy (absolute magnitude -6.75). It is also fainter than the star Rigel (absolute magnitude -6.8). This discounts dark galaxies such as VIRGOHI21 in the Virgo cluster of galaxies.
[edit] External links
- The Universe within 500,000 light-years The Satellite Galaxies (Atlas of the Universe)
- Two New Galaxies Orbiting the Milky Way (Ken Croswell) April 19, 2006
- Strange satellite galaxies revealed around Milky Way Kimm Groshong (New Scientist) 17:00 24 April 2006
- New Milky Way companions found: SDSS-II first to view two dim dwarf galaxies (SDSS) May 8, 2006
- Astronomers Find Two New Milky Way Companions (SpaceDaily) May 10, 2006
[edit] Notes
- ^ Apparent magnitude = Absolute magnitude + Distance modulus = -5.8[1] + 18.9[1] = 13.1
[edit] References
- ^ a b c d e f g h Belokurov, V.; Zucker, D. B.; Evans, N. W.; Wilkinson, M. I.; Irwin, M. J.; Hodgkin, S.; Bramich, D. M.; Irwin, J. M.; Gilmore, G.; Willman, B.; Vidrih, S.; Newberg, H. J.; Wyse, R. F. G.; Fellhauer, M.; Hewett, P. C.; Cole, N.; Bell, E. F.; Beers, T. C.; Rockosi, C. M.; Yanny, B.; Grebel, E. K.; Schneider, D. P.; Lupton, R.; Barentine, J. C.; Brewington, H.; Brinkmann, J.; Harvanek, M.; Kleinman, S. J.; Krzesinski, J.; Long, D.; Nitta, A.; Smith, J. A.; Snedden, S. A. (2006). "A Faint New Milky Way Satellite in Bootes". The Astrophysical Journal 647 (2): L111–L114. doi:.
- ^ a b c SIMBAD Astronomical Database. Results for Bootes dSph. Retrieved on 2006-12-20.
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