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Mayall's Object (also classified under the Atlas of Peculiar Galaxies as Arp 148) is the result of two colliding galaxies located 500 million light years away within the constellation of Ursa Major. It was discovered by Nicholas U. Mayall of the Lick Observatory on 13 March 1940, using the Crossley reflector.〔Smith, R. T. ; (The Radial Velocity of a Peculiar Nebula ) ; ''Publications of the Astronomical Society of the Pacific, Vol. 53, No. 313, p.187'' 〕 When first discovered, Mayall's Object was described as a peculiar nebula, shaped like a question mark. Originally theorized to represent a galaxy reacting with the intergalactic medium,〔Burbidge, E. Margaret ''The Strange Extragalactic Systems Mayall's Object and IC 883'', Astrophysical Journal, vol. 140, p1619〕 it is now thought to represent the collision of two galaxies, resulting in a new object consisting of a ring-shaped galaxy with a tail emerging from it. It is thought that the original collision between the two original galaxies created a shockwave that initially drew matter into the center which then formed the ring.〔http://hubblesite.org/newscenter/archive/releases/2008/16/image/aa/ HubbleSite: Cosmic Collisions Galore!, April 24, 2008, accessed August 10, 2008〕 ==See also== *Ring galaxy *Interacting galaxy *Irregular galaxy *Peculiar galaxy *Mayall II, Mayall III, Mayall IV, Mayall V, Mayall VI 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mayall's Object」の詳細全文を読む スポンサード リンク
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