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NGC 4848
Galaxy in the constellation Coma Berenices From Wikipedia, the free encyclopedia
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NGC 4848 is a barred spiral galaxy in the constellation Coma Berenices. It is circa 340 million light-years from Earth, which, given its apparent dimensions, means that NGC 4848 is about 170,000 light years across. It was discovered by Heinrich d'Arrest on April 21, 1865.[3] It is considered part of the Coma Cluster, which is in its northwest part. The galaxy has been stripped of its gas as it passed through the cluster.[4]
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Characteristics
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NGC 4848 is a spiral galaxy viewed nearly edge-on that is classified as SBab by de Vaucouleurs. Its nucleus is active, and it has been categorised as an HII region.[5] A number of bright HII regions form a ring around the nucleus with a radius of 5–10 arcseconds. The star formation rate is estimated to be 9 M☉ per year based on the H-alpha, ultraviolet, infrared and radio luminosity.[4]
The galaxy distribution of hydrogen gas is asymmetrical and forms a tail pointing away from the cluster center. The tail has projected dimensions of 62.5 by 18.5 kpc and an estimated hydrogen mass of 4×109 M☉. The tail was probably formed as a result of ram pressure as the galaxy passed through the Coma Cluster and its intergalactic medium at a speed of about 1,330 km/s, starting 200 million years ago according to Fossati et al.,[4] while a previous study indicated a timeline of 400 million years.[6] The lost hydrogen is estimated to comprise two thirds of the original hydrogen content of the galaxy.[6] A few star-forming regions, probably HII regions, are in the tail.[4]
A dwarf galaxy may cross the disk of NGC 4848; however, its mass is too low to be a source of the hydrogen tail.[6]
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See also
- NGC 4921, a spiral galaxy in the Coma Cluster that has lost its hydrogen
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