Boötes Dwarf Galaxy

Infobox Galaxy


name = Boötes Dwarf Galaxy
epoch = J2000
type = dSphcite journal
author=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.
title=A Faint New Milky Way Satellite in Bootes
journal=The Astrophysical Journal
year=2006
volume=647
issue=2
pages=L111–L114
url=http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2006ApJ...647L.111B
doi=10.1086/507324 ]
ra = RA|14|00|06
dec = DEC|+14|30|00 ± 15″
dist_ly = 197 ± 18 kly (60 ± 6 kpc)
z =
appmag_v = 13.1Ref_label|A|a|none
size_v = 26′.0 ± 1′.4
constellation name = Boötes
notes =
names = Boo dSph,Fact|date=February 2007 Boötes Satellite,cite web
title=SIMBAD Astronomical Database
work=Results for Bootes dSph
url=http://simbad.u-strasbg.fr/Simbad
accessdate=2006-12-20]
Boötes Dwarf Spheroidal Galaxy,
Boötes dSph galaxy

The Boötes Dwarf Galaxy ("Boo dSph") is the faintest galaxy yet discovered,Fact|date=February 2007 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 by the Milky Way Galaxy which it orbits, and has two stellar trails that cross over to form a cross.Fact|date=February 2007 Tidally disrupted galaxies usually only form one tail.Fact|date=February 2007

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.

External links

* [http://www.atlasoftheuniverse.com/sattelit.html The Universe within 500,000 light-years The Satellite Galaxies] (Atlas of the Universe)
* [http://kencroswell.com/BootesCanesVenaticiDwarfs.html Two New Galaxies Orbiting the Milky Way] (Ken Croswell) April 19, 2006
* [http://www.newscientistspace.com/article/dn9043-strange-satellite-galaxies-revealed-around-milky-way.html Strange satellite galaxies revealed around Milky Way] Kimm Groshong (New Scientist) 17:00 24 April 2006
* [http://www.sdss.org/news/releases/20060508.companions.html New Milky Way companions found: SDSS-II first to view two dim dwarf galaxies] (SDSS) May 8, 2006
* [http://www.spacedaily.com/reports/Astronomers_Find_Two_New_Milky_Way_Companions.html Astronomers Find Two New Milky Way Companions] (SpaceDaily) May 10, 2006

Notes

1. Note_label|A|a|noneApparent magnitude = Absolute magnitude + Distance modulus = -5.8 + 18.9 = 13.1

References