Segue 1

Segue 1
Observation data (J2000 epoch)
ConstellationLeo
Right ascension10h 07m 04s[1]
Declination16° 04′ 55″[1]
Distance75 ± 6.5 kly (23 ± 2 kpc)[2]
Apparent magnitude (V)13.8 ± 0.5[2]
Characteristics
TypedSph or GC[1][2]
Mass/Light ratio3400 (V)[3] M☉/L☉
Apparent size (V)8.8′[4]
Other designations
Segue 1, PGC 4713559

Segue 1 is a dwarf spheroidal galaxy or globular cluster situated in the Leo constellation and discovered in 2006 by Sloan Digital Sky Survey.[2] It is located at a distance of about 23 kpc (about 75,000 light years) from the Sun and moves away from the Sun with the velocity of about 206 km/s.[2][5] Segue 1 has a noticeably elongated (ratio of axes ~ 2:1) shape with the half-light radius of about 30 pc.[2][4] This elongation may be caused by the tidal forces acting from the Milky Way galaxy if Segue 1 is being tidally disrupted now.[6]

The name is due to the fact that it was found by the SEGUE program, the Sloan Extension for Galactic Understanding and Exploration.

  1. ^ a b c "NAME Segue 1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-03-13.
  2. ^ a b c d e f Belokurov, V.; Zucker, D. B.; Evans, N. W.; Kleyna, J. T.; Koposov, S.; Hodgkin, S. T.; Irwin, M. J.; Gilmore, G.; Wilkinson, M. I.; Fellhauer, M.; Bramich, D. M.; Hewett, P. C.; Vidrih, S.; De Jong, J. T. A.; Smith, J. A.; Rix, H. -W.; Bell, E. F.; Wyse, R. F. G.; Newberg, H. J.; Mayeur, P. A.; Yanny, B.; Rockosi, C. M.; Gnedin, O. Y.; Schneider, D. P.; Beers, T. C.; Barentine, J. C.; Brewington, H.; Brinkmann, J.; Harvanek, M.; Kleinman, S. J. (2007). "Cats and Dogs, Hair and a Hero: A Quintet of New Milky Way Companions". The Astrophysical Journal. 654 (2): 897–906. arXiv:astro-ph/0608448. Bibcode:2007ApJ...654..897B. doi:10.1086/509718. S2CID 18617277.
  3. ^ Cite error: The named reference Simon2011 was invoked but never defined (see the help page).
  4. ^ a b Martin, N. F.; De Jong, J. T. A.; Rix, H. W. (2008). "A Comprehensive Maximum Likelihood Analysis of the Structural Properties of Faint Milky Way Satellites". The Astrophysical Journal. 684 (2): 1075–1092. arXiv:0805.2945. Bibcode:2008ApJ...684.1075M. doi:10.1086/590336. S2CID 17838966.
  5. ^ Geha, Marla; Willman, Beth; Simon, Joshua D.; Strigari, Louis E.; Kirby, Evan N.; Law, David R.; Strader, Jay (2009). "The Least-Luminous Galaxy: Spectroscopy of the Milky Way Satellite Segue 1". The Astrophysical Journal. 692 (2): 1464–1475. arXiv:0809.2781. Bibcode:2009ApJ...692.1464G. doi:10.1088/0004-637X/692/2/1464. S2CID 8894302.
  6. ^ Cite error: The named reference Niederste-Ostholt2009 was invoked but never defined (see the help page).