Boötes I Explained

Boötes Dwarf Galaxy
Epoch:J2000
Type:dSph
Dec: ± 15
Dist Ly:197 ± 18 kly (60 ± 6 kpc)
Appmag V:13.1
Size V:26.0 ± 1.4
Constellation Name:Boötes
Names:Boo dSph, Boötes Satellite, Boötes Dwarf Spheroidal Galaxy, Boötes dSph galaxy,[1] PGC 4713553

The Boötes Dwarf Galaxy (Boo I dSph) is a galaxy discovered in 2006, which appears faint, with a luminosity of and an absolute magnitude of –5.8. It lies about 197000ly away in the constellation Boötes. This dwarf spheroidal galaxy appears to be tidally disrupted[2] by the Milky Way Galaxy, which it orbits, and has two stellar tails that cross over to form a cross. Tidally disrupted galaxies usually only form one tail. The galaxy appears to be significantly elongated, with an ellipticity of .[3]

Like many of the ultrafaint dwarf spheroidals, the entire galaxy appears fainter than the Rigel system (absolute magnitude –7.84).[4] Even so, it is one of the more luminous UFDs.[5] It is metal-poor, like other UFDs, with a mean 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]

Notes

  1. Apparent magnitude = Absolute magnitude + Distance modulus = –5.8 + 18.9 = 13.1

External links

Notes and References

  1. NAME Bootes Dwarf Spheroidal Galaxy . 2006-12-20.
  2. 4 . 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. . A Faint New Milky Way Satellite in Bootes . The Astrophysical Journal . 2006 . 647 . 2 . L111–L114 . 2006ApJ...647L.111B . 10.1086/507324 . astro-ph/0604355 . 15348323 .
  3. 10.1093/mnras/stac1827 . 2022MNRAS.516.2348L . 2107.10849 . The Pristine dwarf galaxy survey – IV. Probing the outskirts of the dwarf galaxy Boötes I . 2022 . 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 . Monthly Notices of the Royal Astronomical Society . 516 . 2 . 2348–2362 . free .
  4. 2014MNRAS.438.1114S. 1311.5116. An observational evaluation of magnetic confinement in the winds of BA supergiants. Monthly Notices of the Royal Astronomical Society. 438. 2. 1114. Shultz. M.. Wade. G. A.. Petit. V.. Grunhut. J.. Neiner. C.. Hanes. D.. MiMeS Collaboration. 2014. 10.1093/mnras/stt2260. free .
  5. 10.3847/1538-4357/ac1353 . 2101.00013. Very Large Telescope Spectroscopy of Ultra-faint Dwarf Galaxies. I. Boötes I, Leo IV, and Leo V. 2021. Jenkins. Sydney A.. Li. Ting S.. Pace. Andrew B.. Ji. Alexander P.. Koposov. Sergey E.. Mutlu-Pakdil. Burçin. The Astrophysical Journal. 920. 2. 92. 2021ApJ...920...92J . 230433692 . free .
  6. 10.1088/0004-637X/796/2/91. The Quenching of the Ultra-Faint Dwarf Galaxies in the Reionization Era. 2014. Brown. Thomas M.. Tumlinson. Jason. Geha. Marla. Marla Geha . 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. The Astrophysical Journal. 796. 2. 91. 1410.0681 . 2014ApJ...796...91B . 10097277.

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