Holmberg IX

Holmberg IX
Hubble Space Telescope image of the dwarf irregular galaxy Holmberg IX
Observation data (J2000 epoch)
Constellation	Ursa Major
Right ascension	09h 57m 32.1s [1]
Declination	+69° 02′ 46″ [1]
Distance	12 Mly (3.6 Mpc) [2]
Apparent magnitude  (V)	16.5 [1]
Characteristics
Type	dI [1]
Apparent size  (V)	1.41 ± 0.07 [1]
Notable features	Satellite galaxy of Messier 81
Other designations
UGC 5336, [B93] 17, DDO 66, 2E 0953.7+6918, 2E 2199, 1ES 0953+69.3, HIJASS J0957+69A, Holmberg IX, [IW2001] H42, [IW2001] P63, K68 62, LEDA 28757, Mailyan 48, MCG+12-10-012, [MI94] Im 62, SPB 118, PGC 28757

Holmberg IX is a dwarf irregular galaxy and a satellite galaxy of M81, located in the constellation of Ursa Major. It is a Magellanic type galaxy, similar to the Small Magellanic Cloud, neighbour galaxy to the Milky Way Galaxy. ^[3] The galaxy is named after Erik Holmberg who first described it, though it was originally discovered by Sidney van den Bergh in 1959. ^{[4] [3]} Based on the observed age distribution of stars it contains, 20% of its stellar mass formed within the last 200 Myr, making it the youngest nearby galaxy. ^[5] It is also home to one of two yellow supergiant eclipsing binary systems. ^{[6] [7]}

References

1. "UGC 5336". SIMBAD . Centre de données astronomiques de Strasbourg.
2. Prieto, J. L.; et al. (January 2008). "LBT Discovery of a Yellow Supergiant Eclipsing Binary in the Dwarf Galaxy Holmberg IX". The Astrophysical Journal . 673 (1): L59 –L62. arXiv: 0709.2376 . Bibcode:2008ApJ...673L..59P. doi:10.1086/527415. S2CID   118735678.
3. "Holmberg IX news from Hubblesite". Hubblesite. 8 January 2008.
4. Van Den Bergh, Sidney (1959). "A Catalogue of Dwarf Galaxies". Publications of the David Dunlap Observatory. 2 (5): 147. Bibcode:1959PDDO....2..147V.
5. Sabbi, E.; Gallagher, J. S.; Smith, L. J.; de Mello, D. F.; Mountain, M. (March 2006). "Holmberg IX: The Nearest Young Galaxy". The Astrophysical Journal . 676 (2): L113 –L117. arXiv: 0802.4446 . Bibcode:2008ApJ...676L.113S. doi:10.1086/587548. S2CID   119205873.
6. "Two new Star Systems are the First of Their kind Ever Found". Archived from the original on 2008-04-02.
7. "Two Yellow Supergiant Eclipsing Binary Systems Discovered: First Of Their Kind Ever Found". Science Daily. 2008-04-01.

Further reading

• Winter, Lisa M.; Mushotzky, Richard F.; Reynolds, Christopher S. (2007). "Elemental Abundances of Nearby Galaxies through High Signal-to-Noise Ratio XMM-Newton Observations of Ultraluminous X-Ray Sources". The Astrophysical Journal . 655 (1): 163–178. arXiv: astro-ph/0610369 . Bibcode:2007ApJ...655..163W. doi:10.1086/510200. S2CID   115819754.
• Fabien, Grisé; Pakull, Manfred W.; Motch, Christian (2006-05-12). "The Ultraluminous X-ray Source in Holmberg IX and its Environment". Proceedings of the International Astronomical Union. 1 (S230): 302–303. arXiv: astro-ph/0603768 . Bibcode:2006IAUS..230..302G. doi:10.1017/S1743921306008519. S2CID   118995588.
• Makarova, L.; Grebel, E. K.; Karachentsev, I. D.; Dolphin, A. E.; Karachentseva, V. E.; Sharina, M. E.; Geisler, D.; Guhathakurta, P.; et al. (2002). "Tidal dwarfs in the M81 group: the second generation?". Astronomy and Astrophysics . 396 (2): 473–487. arXiv: astro-ph/0210235 . Bibcode:2002A&A...396..473M. doi:10.1051/0004-6361:20021426.
• Schulte-Ladbeck, R. E.; Hopp, U. (1987). "The Dwarf Irregular Galaxy Holmberg IX". Mitteilungen der Astronomischen Gesellschaft. 70: 427. Bibcode:1987MitAG..70..427S.
• Bertola, F.; Maffei, P. (1974). "Two Faint Companions to M81". Astronomy and Astrophysics . 32: 117. Bibcode:1974A&A....32..117B.
• Holmberg, E. (1969). "A study of physical groups of galaxies". Arkiv för Astronomi. 5: 305–343. Bibcode:1969ArA.....5..305H.
• van den Bergh, Sidney (1959). "A catalogue of dwarf galaxies". Publications of the David Dunlap Observatory. 2 (5). University of Toronto: 147. Bibcode:1959PDDO....2..147V.

External links

• Media related to Holmberg IX at Wikimedia Commons
• M81's satellite galaxy Holmberg IX
• Holmberg IX: XMM1
• GALEX Completes Four Star-Studded Years in Space
• Dwarf Galaxy Holmberg IX
• Holmberg IX on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images