The Boötes Dwarf Galaxy (Boo I dSph) is a galaxy discovered in 2006, which appears faint, with a luminosity of 100,000L☉ and an absolute magnitude of –5.8. It lies about 197,000 light-years (60.4 kiloparsecs) away in the constellation Boötes. This dwarf spheroidal galaxy appears to be tidally disrupted[1] by the Milky Way Galaxy, which it orbits, and has two stellar tails that cross over to form a cross.[citation needed] Tidally disrupted galaxies usually only form one tail.[citation needed]
Like many of the ultrafaint dwarf spheroidals, the entire galaxy appears fainter than the Rigel system (absolute magnitude –7.84).[3] Even so, it is one of the more luminous UFDs.[4] It is metal-poor, like other UFDs, with a mean metallicity of −2.34.[4]
The stellar population of Boötes I is mostly very old stars. The two populations have essentially the same age, 13.4 billion and 13.3 billion years, respectively, with most of the stars being of the latter population.[5]
Belokurov, V.; Zucker, D. B.; Evans, N. W.; Wilkinson, M. I.; etal. (2006). "A Faint New Milky Way Satellite in Bootes". The Astrophysical Journal. 647 (2): L111–L114. arXiv:astro-ph/0604355. Bibcode:2006ApJ...647L.111B. doi:10.1086/507324. S2CID15348323.
Shultz, M.; Wade, G. A.; Petit, V.; Grunhut, J.; Neiner, C.; Hanes, D.; MiMeS Collaboration (2014). "An observational evaluation of magnetic confinement in the winds of BA supergiants". Monthly Notices of the Royal Astronomical Society. 438 (2): 1114. arXiv:1311.5116. Bibcode:2014MNRAS.438.1114S. doi:10.1093/mnras/stt2260.
Jenkins, Sydney A.; Li, Ting S.; Pace, Andrew B.; Ji, Alexander P.; Koposov, Sergey E.; Mutlu-Pakdil, Burçin (2021). "Very Large Telescope Spectroscopy of Ultra-faint Dwarf Galaxies. I. Boötes I, Leo IV, and Leo V". The Astrophysical Journal. 920 (2): 92. arXiv:2101.00013. doi:10.3847/1538-4357/ac1353. S2CID230433692.
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