NGC 5170
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NGC 5170 is a large, nearby,[1] edge-on spiral galaxy in the equatorial constellation of Virgo. It was discovered on February 7, 1785 by William Herschel. This galaxy is located at a distance of 83.5 million light years and is receding at a heliocentric radial velocity of Script error: No such module "val"..[2] It is a member of the Virgo II Groups, a series of galaxies and galaxy clusters strung out from the southern edge of the Virgo Supercluster.[3]
The inclination of the galactic plane of NGC 5170 is tilted at an angle of Script error: No such module "val". to the line of sight from the Earth, which means the disk is significantly obscured. It is estimated to have a morphological class of type Sb to Sc, meaning the spiral arms are moderate to loosely wound. The bulge-to-disk ratio of 0.5 is more consistent with an Sb galaxy.[4] It has an estimated star formation rate of Script error: No such module "val".·yr−1, which is more than double the rate in the Milky Way.[4]
The galactic latitude of this star is 43°, making the field relatively free of stars in the Milky Way. Combined with the proximity and edge-on view of NGC 5170, this makes galaxy useful for studies of its globular cluster population. It is estimated to have a total of Script error: No such module "val". globulars, which is much higher than for the Milky Way. A candidate ultra-compact dwarf galaxy has been identified that is associated with NGC 5170.[4]
Numerical modeling of this galaxy indicates it has a massive dark halo with a thin, low surface brightness disk.[1] The halo mass of NGC 5170 is Script error: No such module "val"..[4] Examination of the galaxy with the Chandra X-ray Observatory showed there is no diffuse X-ray emission from hot gas in the extended galactic halo.[5]
References
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