Galaxy in the constellation Boötes
TheBoötes Dwarf Galaxy (Boo I dSph ) is agalaxy discovered in 2006, which appears faint, with aluminosity of 100,000 L ☉ absolute magnitude of –5.8. It lies about 197,000light-years (60.4kiloparsecs ) away in the constellationBoötes . Thisdwarf spheroidal galaxy appears to betidally disrupted [ 1] Milky Way Galaxy, whichit 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 The galaxy appears to be significantly elongated, with an ellipticity ofε = 0.68 ± 0.15 .[ 3]
Like many of the ultrafaint dwarf spheroidals, the entire galaxy appears fainter than theRigel system (absolute magnitude –7.84).[ 4] [ 5] metallicity of −2.34.[ 5]
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.[ 6]
^a b c d e f g h Belokurov, V.; Zucker, D. B.; Evans, N. W.; Wilkinson, M. I.; et al. (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 .S2CID 15348323 . ^ "NAME Bootes Dwarf Spheroidal Galaxy" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2006-12-20 .^ Longeard, Nicolas; Jablonka, Pascale; Arentsen, Anke; Thomas, Guillaume F.; Aguado, David S.; Carlberg, Raymond G.; Lucchesi, Romain; Malhan, Khyati; Martin, Nicolas; McConnachie, Alan W.; Navarro, Julio F.; Sánchez-Janssen, Rubén; Sestito, Federico; Starkenburg, Else; Yuan, Zhen (2022)."The Pristine dwarf galaxy survey – IV. Probing the outskirts of the dwarf galaxy Boötes I" .Monthly Notices of the Royal Astronomical Society .516 (2):2348– 2362.arXiv :2107.10849 Bibcode :2022MNRAS.516.2348L .doi :10.1093/mnras/stac1827 ^ 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 ^a b 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 Bibcode :2021ApJ...920...92J .doi :10.3847/1538-4357/ac1353 S2CID 230433692 . ^ Brown, Thomas M.; Tumlinson, Jason;Geha, Marla ; Simon, Joshua D.; Vargas, Luis C.; Vandenberg, Don A.; Kirby, Evan N.; Kalirai, Jason S.; Avila, Roberto J.; Gennaro, Mario; Ferguson, Henry C.; Muñoz, Ricardo R.; Guhathakurta, Puragra; Renzini, Alvio (2014)."The Quenching of the Ultra-Faint Dwarf Galaxies in the Reionization Era" .The Astrophysical Journal .796 (2): 91.arXiv :1410.0681 Bibcode :2014ApJ...796...91B .doi :10.1088/0004-637X/796/2/91 .S2CID 10097277 .
