| 词条 | Ursa Major I Dwarf |
| 释义 |
| name = Ursa Major I Dwarf | image = | epoch = J2000 | type = dSph | ra = {{RA|10|34|52.8}}[1] | dec = {{DEC|+51|55|12}}[1] | dist_ly = 330,000 light-years (100 kpc)[3] | z = | appmag_v = | size_v = | constellation name = Ursa Major | notes = | names = UMa I dwarf,[1] Ursa Major I dSph[1] }}Ursa Major I Dwarf (UMa I dSph) is a dwarf spheroidal galaxy orbiting the Milky Way galaxy. Its discovery was revealed by Beth Willman et al. in 2005.[2] Being a small dwarf galaxy, it measures only a few thousand light-years in diameter. As of 2006, it is the third least luminous galaxy known (discounting possible dark galaxies such as VIRGOHI21 in the Virgo cluster of galaxies), after the Boötes Dwarf (absolute magnitude −5.7) and the more recently discovered Ursa Major II Dwarf (absolute magnitude −3.8). The absolute magnitude of the galaxy is estimated to be only −6.75,[2] meaning that it is less luminous than some stars, like Deneb in the Milky Way. It is comparable in luminosity to Rigel. It has been described as similar to the Sextans Dwarf Galaxy.[2] Both galaxies are ancient and metal-deficient. It estimated to be located at a distance of about 330,000 light-years (100 kpc) from the Earth.[2] That is about twice the distance to the Large Magellanic Cloud; the largest and most luminous satellite galaxy of the Milky Way. There was another object called "Ursa Major Dwarf", discovered by Edwin Hubble in 1949.[3] It was designated as Palomar 4. Due to its peculiar look, it was temporarily suspected to be either a dwarf spheroidal or elliptical galaxy. However, it has since been found to be a very distant (about 360,000 ly) globular cluster belonging to our galaxy. See also
References1. ^1 2 3 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for Ursa Major dSph | url=http://nedwww.ipac.caltech.edu/ | accessdate=2006-11-27 }} 2. ^1 2 3 4 {{cite journal |title=A New Milky Way Dwarf Galaxy in Ursa Major |first= Beth |last= Willman |first2=Julianne |last2= J. Dalcanton |first3= David |last3= Martinez-Delgado |first4= Andrew |last4= A. West |display-authors=3 |date=24 May 2005 |journal=The Astrophysical Journal Letters |volume=626 |issue=2 |pages=L86-L88 |bibcode= 2005ApJ...626L..85W |doi=10.1086/431760 |arxiv=astro-ph/0503552}} 3. ^{{cite web | title=Ursa Major Dwarf, Palomar 4 | work=Milky Way Globular Clusters | url=http://www.seds.org/~spider/spider/MWGC/pal04.html | accessdate=April 16, 2005 | deadurl=yes | archiveurl=https://web.archive.org/web/20050408141516/http://www.seds.org/~spider/spider/MWGC/pal04.html | archivedate=April 8, 2005 | df= }} External links
5 : Dwarf spheroidal galaxies|Local Group|Milky Way Subgroup|Ursa Major (constellation)|Astronomical objects discovered in 2005 |
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