NGC 4194
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NGC 4194, the Medusa merger, is a galaxy merger in the constellation Ursa Major about Script error: No such module "convert". away.[1] It was discovered on April 2, 1791 by German-British astronomer William Herschel.[2] Due to its disturbed appearance, it is object 160 in Halton Arp's 1966 Atlas of Peculiar Galaxies.[3]
The morphological classification of NGC 4194 is Imeger,[4] indicating an irregular form. This galaxy consists of a brighter central region spanning an angular size Script error: No such module "val". across, with an accompanying system of loops and arcs. Additional material is thinly spread out to a radius of Script error: No such module "val". from the central region.[5] There is a tidal tail and regions undergoing high levels of star formation, making this a starburst galaxy. It is a source for strong infrared and radio emission.[6][7] These features indicate NGC 4194 is a late-stage galaxy merger.[8] A region of extreme star formation Script error: No such module "convert". across exists in the center of the Eye of Medusa, the central gas-rich region.[9]
Within Template:Cvt of the dynamic center of NGC 4194, star formation is occurring at a rate of Script error: No such module "val".·yr−1. The star forming regions in this volume range from 5 to 9 million years in age, with the youngest occurring in areas of the highest star formation rate.[10] As of 2014, no galactic nucleus has been detected based on radio emissions, nor have the respective nuclei of the merger galaxies.[11] However, X-ray emission from a black hole in the tidal tail was detected by Chandra in 2009.[12]
References
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Further reading
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