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Sextans Dwarf Spheroidal

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10^h13^m02.9^s, −01° 36′53″ From Wikipedia, the free encyclopedia (Redirected from Sextans Dwarf Galaxy)

Sextans Dwarf Spheroidal
Observation data (J2000 epoch)
Constellation	Sextans
Right ascension	10^h13^m 02.9^s^[1]
Declination	−01° 36′ 53″^[1]
Redshift	224 ± 2 km/s^[1]
Distance	290 ± 30 kly (90 ± 10 kpc)^[2]^[3]
Apparent magnitude (V)	10.4^[1]
Characteristics
Type	dSph^[1]
Apparent size (V)	30.0′ × 12.0′^[1]
Notable features	satellite galaxy of the Milky Way
Other designations
Sextans I,^[1] LEDA 88608^[1]

The Sextans Dwarf Spheroidal is a dwarf spheroidal galaxy that was discovered in 1990 by Mike Irwin as the 8th satellite of the Milky Way,^[4] located in the constellationofSextans. It is also an elliptical galaxy, and displays a redshift because it is receding from the Sun at 224 km/s (72 km/s from the Galaxy). The distance to the galaxy is 320,000 light-years and the diameter is 8,400 light-years along its major axis.^[5]

Like other dwarf spheroidal galaxies, the Sextans Dwarf's population consists of old, metal-poor stars: one study found that the majority of stars have a metallicity between [Fe/H] = −3.2 and −1.4. An analysis of several stars found them to also be deficient in barium, except for one star.^[6]

References

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^ ^a ^b ^c ^d ^e ^f ^g ^h "NASA/IPAC Extragalactic Database". Results for Sextans Dwarf. Retrieved 2006-11-29.

^ I. D. Karachentsev; V. E. Karachentseva; W. K. Hutchmeier; D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal. 127 (4): 2031–2068. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.

^ Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics. 49 (1): 3–18. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6. S2CID 120973010.

^ M. J. Irwin; P. S. Bunclark; M. T. Bridgeland; R. G. McMahon (1990). "A new satellite galaxy of the Milky Way in the constellation of Sextans". Monthly Notices of the Royal Astronomical Society. 244: 16–19. Bibcode:1990MNRAS.244P..16I.

^ Hartmut Frommert. "Sextans Dwarf". SEDS. Retrieved 2015-03-21.