Leo T

Leo T Dwarf Galaxy[1]
Observation data (J2000 epoch)
ConstellationLeo
Right ascension09h 34m 53.4s[1]
Declination+17° 03′ 05″[1]
Distance1,330 kly (409 kpc)[2]
Apparent magnitude (V)16[3]
Characteristics
TypedSph/dIrr
Apparent size (V)2.8′[3]
Other designations
Leo T,[1] PGC 4713564

Leo T is a dwarf galaxy situated in the Leo constellation and discovered in 2006 in the data obtained by Sloan Digital Sky Survey.[3] The galaxy is located at the distance of about 409 kpc from the Sun[2] and moves away from the Sun with the velocity of about 35 km/s.[3][4] The velocity with respect to the Milky Way is around −60 km/s implying a slow infall onto the Milky Way.[4] Leo T is classified as a transitional object ('T' in the name) between dwarf spheroidal galaxies (dSph) and dwarf irregular galaxies (dIrr). Its half-light radius is about 180 pc.[3]

Leo T is one of the smallest and faintest galaxies in the Local Group—its integrated luminosity is about 40,000 times that of the Sun (absolute visible magnitude of about −7.1).[note 1][3] However, its mass is about 8 million solar masses, which means that Leo's mass to light ratio is around 140. A high mass to light ratio implies that Leo T is dominated by dark matter.[4]

  1. ^ a b c d "NAME Leo T dSph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-03-14.
  2. ^ a b Vaz, Daniel; Brinchmann, Jarle; Zoutendijk, Sebastiaan L.; Boogaard, Leindert A.; Kamann, Sebastian; Read, Justin I.; Roth, Martin M.; Weilbacher, Peter M.; Steinmetz, Matthias (2023). "The MUSE-Faint survey. IV. Dissecting Leo T, a gas-rich relic with recent star formation". Astronomy & Astrophysics. 678: A59. arXiv:2308.16263. Bibcode:2023A&A...678A..59V. doi:10.1051/0004-6361/202346453.
  3. ^ a b c d e f Irwin, V.; Belokurov, V.; Evans, N. W.; et al. (2007). "Discovery of an Unusual Dwarf Galaxy in the Outskirts of the Milky Way". The Astrophysical Journal. 656 (1): L13–L16. arXiv:astro-ph/0701154. Bibcode:2007ApJ...656L..13I. doi:10.1086/512183. S2CID 18742260.
  4. ^ a b c Simon, Joshua D.; Geha, Marla (2007). "The Kinematics of the Ultra-faint Milky Way Satellites: Solving the Missing Satellite Problem". The Astrophysical Journal. 670 (1): 313–331. arXiv:0706.0516. Bibcode:2007ApJ...670..313S. doi:10.1086/521816. S2CID 9715950.
  5. ^ Cite error: The named reference Jong2008 was invoked but never defined (see the help page).


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