Andromeda XIX

Andromeda XIX
Andromeda XIX
Observation data (J2000 epoch)
Constellation	Andromeda
Right ascension	00h 19m 32.10s
Declination	+35° 02′ 37.1″
Redshift	0.003903
Distance	2,651 kly (812.8 kpc)
Apparent magnitude (V)	−10.1
Absolute magnitude (V)	14.5
Characteristics
Type	dG
Half-light radius (physical)	1700 pc
Notable features	Satellite of Andromeda Galaxy, extremely diffuse
Other designations
	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.^[3] Andromeda XIX is considered "the most extended dwarf galaxy known in the Local Group",^[4] and has been shown to have a half-light radius of 1.7 kiloparsec (kpc).^[4] 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.^[2]

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.^[5] They include: Andromeda XI, XII, XIII, XV, XVI, XVIII, XIX, and XX.^[5]

References

^ ^a ^b ^c ^d "Results for ANDROMEDA XIX". NASA/IPAC Extragalactic Database. Retrieved January 15, 2017.
^ ^a ^b ^c ^d Collins, Michelle L M.; Williams, Benjamin F.; Tollerud, Erik J.; Balbinot, Eduardo; Gilbert, Karoline M.; Dolphin, Andrew (2022). "A detailed star formation history for the extremely diffuse Andromeda XIX dwarf galaxy". Monthly Notices of the Royal Astronomical Society. 517 (3): 4382–4388. arXiv:2209.12912. Bibcode:2022MNRAS.517.4382C. doi:10.1093/mnras/stac2794.
^ "Chart (Local Galaxies)". University of Northern Iowa. Retrieved 18 April 2012.
^ ^a ^b McConnachie, Alan W.; Huxor, Avon; Martin, Nicolas F.; Irwin, Mike J.; Chapman, Scott C.; Fahlman, Gregory; Ferguson, Annette M. N.; Ibata, Rodrigo A.; et al. (1 December 2008). "A Trio of New Local Group Galaxies with Extreme Properties". The Astrophysical Journal. 688 (2): 1009–1020. arXiv:0806.3988. Bibcode:2008ApJ...688.1009M. doi:10.1086/591313. S2CID 16950090. Retrieved 18 April 2012.
^ ^a ^b ^c Martin, Nicolas F.; McConnachie, Alan W.; Irwin, Mike; Widrow, Lawrence M.; Ferguson, Annette M. N.; Ibata, Rodrigo A.; Dubinski, John; Babul, Arif; et al. (1 November 2009). "PAndAS' CUBS: Discovery of Two New Dwarf Galaxies in the Surroundings of the Andromeda and Triangulum Galaxies". The Astrophysical Journal. 705 (1): 758–765. arXiv:0909.0399. Bibcode:2009ApJ...705..758M. doi:10.1088/0004-637X/705/1/758. S2CID 15277245. Retrieved 18 April 2012.

[ned-1] "Results for ANDROMEDA XIX". NASA/IPAC Extragalactic Database. Retrieved January 15, 2017.

[Collins-2] Collins, Michelle L M.; Williams, Benjamin F.; Tollerud, Erik J.; Balbinot, Eduardo; Gilbert, Karoline M.; Dolphin, Andrew (2022). "A detailed star formation history for the extremely diffuse Andromeda XIX dwarf galaxy". Monthly Notices of the Royal Astronomical Society. 517 (3): 4382–4388. arXiv:2209.12912. Bibcode:2022MNRAS.517.4382C. doi:10.1093/mnras/stac2794.

[3] "Chart (Local Galaxies)". University of Northern Iowa. Retrieved 18 April 2012.

[arxiv-4] McConnachie, Alan W.; Huxor, Avon; Martin, Nicolas F.; Irwin, Mike J.; Chapman, Scott C.; Fahlman, Gregory; Ferguson, Annette M. N.; Ibata, Rodrigo A.; et al. (1 December 2008). "A Trio of New Local Group Galaxies with Extreme Properties". The Astrophysical Journal. 688 (2): 1009–1020. arXiv:0806.3988. Bibcode:2008ApJ...688.1009M. doi:10.1086/591313. S2CID 16950090. Retrieved 18 April 2012.

[Dwarf-5] Martin, Nicolas F.; McConnachie, Alan W.; Irwin, Mike; Widrow, Lawrence M.; Ferguson, Annette M. N.; Ibata, Rodrigo A.; Dubinski, John; Babul, Arif; et al. (1 November 2009). "PAndAS' CUBS: Discovery of Two New Dwarf Galaxies in the Surroundings of the Andromeda and Triangulum Galaxies". The Astrophysical Journal. 705 (1): 758–765. arXiv:0909.0399. Bibcode:2009ApJ...705..758M. doi:10.1088/0004-637X/705/1/758. S2CID 15277245. Retrieved 18 April 2012.

[1]

v t e Andromeda Galaxy
Location	Andromeda Galaxy → Andromeda subgroup → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Local Hole → Observable universe → Universe Each → may be read as "within" or "part of".	Andromeda Galaxy
Satellite galaxies	M32 M110 NGC 185 NGC 147 Andromeda I Andromeda II Andromeda III Andromeda IV* Andromeda V Andromeda VI Andromeda VII Andromeda VIII Andromeda IX Andromeda X Andromeda XI Andromeda XII Andromeda XIII Andromeda XIV Andromeda XV Andromeda XVI Andromeda XVII Andromeda XVIII Andromeda XIX Andromeda XX Andromeda XXI Andromeda XXII Andromeda XXIII Andromeda XXIV Andromeda XXV Andromeda XXVI Andromeda XXVII Andromeda XXVIII Andromeda XXIX Triangulum subgroup* *It is uncertain whether these are companion galaxies of the Andromeda Galaxy
Catalogued stars	AE Andromedae AF Andromedae M31-RV
Other	Andromeda–Milky Way collision S Andromedae Mayall II M32p NGC 206 3XMM J004232.1+411314
Category

History

See also

References