Holmberg IX
{{short description|Dwarf irregular galaxy in the constellation of Ursa Major}}
{{Infobox Galaxy
| name = Holmberg IX
| image = File:Hubble_dwarf_galaxy_Holmberg_IX.jpg
| image_size = 250px
| caption = Hubble Space Telescope image of the dwarf irregular galaxy Holmberg IX
| credit = NASA, ESA, and the Hubble Heritage Team
| epoch = J2000
| ra = {{RA|09|57|32.1}}{{Cite simbad | title = UGC 5336 }}
| constellation name = Ursa Major
| z =
| dist_ly = 12 Mly
(3.6 Mpc){{Cite journal | title = LBT Discovery of a Yellow Supergiant Eclipsing Binary in the Dwarf Galaxy Holmberg IX | date = January 2008 | last = Prieto | first = J. L. |display-authors=etal | journal = The Astrophysical Journal | volume = 673 | issue = 1 | pages = L59–L62 | arxiv = 0709.2376 | doi = 10.1086/527415 | bibcode=2008ApJ...673L..59P| s2cid = 118735678 }}
| notes = Satellite galaxy of Messier 81
| names = 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.{{cite news|url=https://hubblesite.org/contents/media/images/2008/02/2236-Image.html|title = Holmberg IX news from Hubblesite| date=8 January 2008|website = Hubblesite}} The galaxy is named after Erik Holmberg who first described it, though it was originally discovered by Sidney van den Bergh in 1959.{{cite journal |bibcode=1959PDDO....2..147V |title=A Catalogue of Dwarf Galaxies |last1=Van Den Bergh |first1=Sidney |journal=Publications of the David Dunlap Observatory |date=1959 |volume=2 |issue=5 |page=147}} 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.{{Cite journal | title = Holmberg IX: The Nearest Young Galaxy | first1 = E. | last1 = Sabbi | last2 = Gallagher | first2 = J. S. | last3 = Smith | first3 = L. J. | last4 = de Mello | first4 = D. F. | last5 = Mountain | first5 = M. | date = March 2006 | journal = The Astrophysical Journal | volume = 676 | issue = 2 | pages = L113–L117 | arxiv = 0802.4446 | doi = 10.1086/587548 | bibcode=2008ApJ...676L.113S| s2cid = 119205873 }} It is also home to one of two yellow supergiant eclipsing binary systems.{{Cite news | title = Two new Star Systems are the First of Their kind Ever Found | url = http://researchnews.osu.edu/archive/superyellow.htm | url-status = dead | archiveurl = https://web.archive.org/web/20080402133205/http://researchnews.osu.edu/archive/superyellow.htm | archivedate = 2008-04-02 }}{{Cite news | title = Two Yellow Supergiant Eclipsing Binary Systems Discovered: First Of Their Kind Ever Found | date = 2008-04-01 | publisher = Science Daily | url = https://www.sciencedaily.com/releases/2008/03/080331135542.htm}}
References
{{Reflist}}
Further reading
- {{Cite journal | title = Elemental Abundances of Nearby Galaxies through High Signal-to-Noise Ratio XMM-Newton Observations of Ultraluminous X-Ray Sources | last1 = Winter | first1 = Lisa M. | last2 = Mushotzky | first2 = Richard F. | last3 = Reynolds | first3 = Christopher S. | journal = The Astrophysical Journal | volume = 655 | issue = 1 | pages = 163–178 | bibcode = 2007ApJ...655..163W | doi = 10.1086/510200 | date = 2007|arxiv = astro-ph/0610369 | s2cid = 115819754 }}
- {{Cite journal | title = The Ultraluminous X-ray Source in Holmberg IX and its Environment | last1 = Fabien | first1 = Grisé | last2 = Pakull | first2 = Manfred W. | last3 = Motch | first3 = Christian | date = 2006-05-12 | journal = Proceedings of the International Astronomical Union | volume = 1 | issue = S230 | pages = 302–303 | arxiv = astro-ph/0603768 | doi = 10.1017/S1743921306008519| bibcode = 2006IAUS..230..302G | s2cid = 118995588 }}
- {{Cite journal | title = Tidal dwarfs in the M81 group: the second generation? | first1 = L. | last1 = Makarova | date = 2002 | journal = Astronomy and Astrophysics | volume = 396 | issue = 2 | pages = 473–487 | arxiv = astro-ph/0210235 | doi = 10.1051/0004-6361:20021426 | last2 = Grebel | first2 = E. K. | last3 = Karachentsev | first3 = I. D. | last4 = Dolphin | first4 = A. E. | last5 = Karachentseva | first5 = V. E. | last6 = Sharina | first6 = M. E. | last7 = Geisler | first7 = D. | last8 = Guhathakurta | first8 = P. | last9 = Hodge | first9 = P. W. | last10 = Sarajedini | first10 = A. | last11 = Seitzer | first11 = P. | bibcode=2002A&A...396..473M| display-authors = 8 }}
- {{Cite journal | title = The Dwarf Irregular Galaxy Holmberg IX | first1 = R. E. | last1 = Schulte-Ladbeck | last2 = Hopp | first2 = U. | date = 1987 | journal = Mitteilungen der Astronomischen Gesellschaft | volume = 70 | bibcode = 1987MitAG..70..427S | pages = 427 }}
- {{Cite journal | title = Two Faint Companions to M81 | first1 = F. | last1 = Bertola | last2 = Maffei | first2 = P. | date = 1974 | journal = Astronomy and Astrophysics | volume = 32 | bibcode = 1974A&A....32..117B | pages = 117 }}
- {{Cite journal | title = A study of physical groups of galaxies | first = E. | last = Holmberg | date = 1969 | journal = Arkiv för Astronomi | volume = 5 | pages = 305–343 | bibcode = 1969ArA.....5..305H}}
- {{Cite journal | title = A catalogue of dwarf galaxies | last = van den Bergh | first = Sidney | date = 1959 | journal = Publications of the David Dunlap Observatory | publisher = University of Toronto | volume = 2 | issue = 5 | bibcode = 1959PDDO....2..147V | pages = 147}}
External links
- {{commonscat-inline}}
- [http://messier.seds.org/more/m081_hom9.html M81's satellite galaxy Holmberg IX]
- [https://web.archive.org/web/20050211172945/http://www.astro.umd.edu/~lwinter/holm9/xmm1.html Holmberg IX: XMM1]
- [http://photojournal.jpl.nasa.gov/catalog/PIA09337 GALEX Completes Four Star-Studded Years in Space]
- [http://hubblesite.org/gallery/album/galaxy_collection/pr2008002d/ Dwarf Galaxy Holmberg IX]
- {{WikiSky}}
{{Sky|09|57|32.1|+|69|02|46|12000000}}