Astronomy:Andromeda XIX

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Short description: Satellite galaxy of the Andromeda galaxy
Andromeda XIX
Observation data (J2000 epoch)
ConstellationAndromeda
Right ascension 00h 19m 32.10s[1]
Declination+35° 02′ 37.1″[1]
Redshift0.003903[1]
Distance2,651 kly (812.8 kpc)[2]
Apparent magnitude (V)−10.1[2]
Absolute magnitude (V)14.5[2]
Characteristics
TypedG
Half-light radius (physical)1700 pc
Notable featuresSatellite of Andromeda Galaxy, extremely diffuse
Other designations
And XIX, LEDA 5056919[1]

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]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 "Results for ANDROMEDA XIX". NASA/IPAC Extragalactic Database. http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=Andromeda+XIX&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES. 
  2. ↑ 2.0 2.1 2.2 2.3 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. doi:10.1093/mnras/stac2794. Bibcode: 2022MNRAS.517.4382C. 
  3. ↑ "Chart (Local Galaxies)". University of Northern Iowa. http://www.uni.edu/morgans/astro/course/Notes/section3/localgroup.html. 
  4. ↑ 4.0 4.1 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. doi:10.1086/591313. Bibcode: 2008ApJ...688.1009M. http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ApJ...688.1009M&link_type=ARTICLE&db_key=AST&high=. Retrieved 18 April 2012. 
  5. ↑ 5.0 5.1 5.2 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. doi:10.1088/0004-637X/705/1/758. Bibcode: 2009ApJ...705..758M. http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ApJ...705..758M&link_type=ARTICLE&db_key=AST&high=. Retrieved 18 April 2012. 




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