Andromeda XIX explained
| Andromeda XIX |
| Epoch: | J2000 |
| Ra: | [1] |
| Constellation Name: | Andromeda |
| Z: | 0.003903 |
| Half Light Radius Pc: | 1700 pc |
| Type: | dG |
| Appmag V: | −10.1 |
| Absmag V: | 14.5 |
| Notes: | Satellite of Andromeda Galaxy, extremely diffuse |
| Names: | And XIX, LEDA 5056919 |
Andromeda XIX is a satellite galaxy of the Andromeda Galaxy (M31), a member of the Local Group, like the Milky Way Galaxy.[2] Andromeda XIX is considered "the most extended dwarf galaxy known in the Local Group",[3] and has been shown to have a half-light radius of 1.7 kiloparsec (kpc). It was discovered by the Canada–France–Hawaii Telescope, and is thought to be a dwarf galaxy.
As with other dwarf galaxies, Andromeda XIX is not producing new stars: 90% of its star formation occurred over 9 billion years ago. However, compared to dwarf galaxies of similar mass Andromeda XIX is extremely diffuse, like Antlia II.[4]
History
Surveillance was performed during use of the MegaPrime/MegaCam 1 deg2 (camera) on the Canada-France-Hawaii Telescope (CFHT) had mapped the Andromeda Galaxy's stellar halo (one quarter) up to ~150 kpc.[5] The survey confirmed the clumpiness of Andromeda's stellar halo. It had shown the existence of multiple other dwarf galaxies. They include: Andromeda XI, XII, XIII, XV, XVI, XVIII, XIX, and XX.
See also
Notes and References
- Web site: NASA/IPAC Extragalactic Database. Results for ANDROMEDA XIX. January 15, 2017.
- Web site: Chart (Local Galaxies). University of Northern Iowa. 18 April 2012.
- McConnachie. Alan W.. Huxor, Avon. Martin, Nicolas F.. Irwin, Mike J.. Chapman, Scott C.. Fahlman, Gregory. Ferguson, Annette M. N.. Ibata, Rodrigo A.. Lewis, Geraint F.. Richer, Harvey. Tanvir, Nial R.. 8. A Trio of New Local Group Galaxies with Extreme Properties. The Astrophysical Journal. 1 December 2008. 688. 2. 1009–1020. 10.1086/591313. 18 April 2012. 0806.3988 . 2008ApJ...688.1009M . 16950090.
- 2209.12912 . 2022MNRAS.517.4382C . 10.1093/mnras/stac2794 . A detailed star formation history for the extremely diffuse Andromeda XIX dwarf galaxy . 2022 . Collins . Michelle L M. . Williams . Benjamin F. . Tollerud . Erik J. . Balbinot . Eduardo . Gilbert . Karoline M. . Dolphin . Andrew . Monthly Notices of the Royal Astronomical Society . 517 . 3 . 4382–4388 . free .
- Martin. Nicolas F.. McConnachie, Alan W.. Irwin, Mike. Widrow, Lawrence M.. Ferguson, Annette M. N.. Ibata, Rodrigo A.. Dubinski, John. Babul, Arif. Chapman, Scott. Fardal, Mark. Lewis, Geraint F.. Navarro, Julio. Rich, R. Michael. 8. PAndAS' CUBS: Discovery of Two New Dwarf Galaxies in the Surroundings of the Andromeda and Triangulum Galaxies. The Astrophysical Journal. 1 November 2009. 705. 1. 758–765 . 10.1088/0004-637X/705/1/758 . 18 April 2012 . 0909.0399 . 2009ApJ...705..758M . 15277245.
