Messier 105
Template:Short description Template:Use dmy dates Template:Infobox Galaxy
Messier 105 or M105, also known as NGC 3379, is an elliptical galaxy 36.6[1] million light-years away in the equatorial constellation of Leo. It is the biggest elliptical galaxy in the Messier catalogue that is not in the Virgo cluster.[2] It was discovered by Pierre Méchain in 1781, just a few days after he discovered the nearby galaxies Messier 95 and Messier 96.Template:Efn[3] This galaxy is one of a few not object-verified by Messier so omitted in the editions of his Catalogue of his era. It was appended when Helen S. Hogg found a letter by Méchain locating and describing this object which matched those aspects under its first-published name, NGC 3379.[3]
Messier 105 has a morphological classification of E1,[4] indicating a standard elliptical galaxy with a flattening of 10%. The major axis is aligned along a position angle of 71°. Isophotes of the galaxy are near perfect ellipses, twisting no more than 5° out of alignment, with changes in ellipticity of no more than 0.06. There is no fine structure apparent in the isophotes, such as ripples.[5] Observation of giant stars in the halo indicate there are two general populations: a dominant metal-rich subpopulation and a weaker metal-poor group.[6]
Messier 105 is known to have a supermassive black hole at its core whose mass is estimated to be between Script error: No such module "val". and Script error: No such module "val"..[7] The galaxy has a weak active galactic nucleus of the LINER type with a spectral class of L2/T2, meaning no broad Hα line and intermediate emission line ratios between a LINER and a H II region.[8] The galaxy also contains a few young stars and stellar clusters, suggesting some elliptical galaxies still form new stars, but very slowly.[9]
This galaxy, along with its companion the barred lenticular galaxy NGC 3384, is surrounded by an enormous ring of neutral hydrogen with a radius of Script error: No such module "convert". and a mass of Script error: No such module "val". where star formation has been detected.[10] Messier 105 is one of several galaxies within the M96 Group (also known as the Leo I Group), a group of galaxies in the constellation Leo, the other Messier objects of which are M95 and M96.[11][12][13][14] It is one of the richest group of galaxies in the Local Volume, and unlike the Local Group, it is dominated by not one but several galaxies.[15]
See also
References and footnotes
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External links
- Template:WikiSky
- "StarDate: M105 Fact Sheet"
- SEDS: Elliptical Galaxy M105
- ESA/Hubble image of M105 Template:Webarchive
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Template:Sky Template:Portal bar Template:Messier objects Template:Ngc35 Template:Leo (constellation)