Sextans Dwarf Spheroidal Explained
| Sextans Dwarf Spheroidal |
| Epoch: | J2000 |
| Type: | dSph[1] |
| Dist Ly: | 290 ± 30 kly (90 ± 10 kpc)[2] [3] |
| Z: | 224 ± 2 km/s |
| Appmag V: | 10.4 |
| Size V: | 30.0 × 12.0 |
| Constellation Name: | Sextans |
| Notes: | satellite galaxy of the Milky Way |
| Names: | Sextans I, LEDA 88608 |
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 constellation of Sextans. 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]
Notes and References
- Web site: NASA/IPAC Extragalactic Database . Results for Sextans Dwarf . 2006-11-29 .
- I. D. Karachentsev. V. E. Karachentseva. W. K. Hutchmeier. D. I. Makarov . A Catalog of Neighboring Galaxies . Astronomical Journal . 2004 . 127 . 4 . 2031–2068 . 2004AJ....127.2031K . 10.1086/382905. free .
- Karachentsev, I. D.. Kashibadze, O. G. . Masses of the local group and of the M81 group estimated from distortions in the local velocity field . Astrophysics . 2006 . 49 . 1 . 3–18 . 2006Ap.....49....3K . 10.1007/s10511-006-0002-6 . 120973010 .
- M. J. Irwin. P. S. Bunclark. M. T. Bridgeland. R. G. McMahon. A new satellite galaxy of the Milky Way in the constellation of Sextans. Monthly Notices of the Royal Astronomical Society. 1990. 244. 16–19. 1990MNRAS.244P..16I.
- Web site: Hartmut Frommert . Sextans Dwarf . SEDS . 2015-03-21.
- 10.1093/mnras/stab3189. 2110.09402. The formation of the Milky Way halo and its dwarf satellites: A NLTE–1D abundance analysis. V. The Sextans galaxy. 2022. Mashonkina. L.. Pakhomov. Yu V.. Sitnova. T.. Jablonka. P.. Yakovleva. S. A.. Belyaev. A. K.. Monthly Notices of the Royal Astronomical Society. 509. 3. 3626–3642. free .
