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Messier 61 (also known as ''M61'' or ''NGC 4303'') is a barred spiral galaxy in the Virgo Cluster. It was discovered by Barnabus Oriani on May 5, 1779. == Properties == M61 is one of the largest members of Virgo, belonging to the subunit known as ''S Cloud''〔 (【引用サイトリンク】 work= )〕〔(【引用サイトリンク】 work= )〕 It has an Active galactic nucleus〔 〕 and it is classified as a starburst galaxy, with a candidate supermassive black hole with a mass around 5 million times that of our Sun on its center.〔 〕 This object is associated with a young, massive star cluster with a mass 100,000 times the one of the Sun, a radius of 3.1 parsecs and an age of 4 million years.〔 〕 Surrounding it, there's a nuclear spiral with a radius of 225 parsecs formed by several massive star-forming regions,〔 〕 that may be associated with a second bar much smaller than the main one of this galaxy.〔 〕 Star formation is also high across M61's disk,〔 〕 perhaps due to interactions with her satellite galaxies NGC 4292 and NGC 4303B.〔 〕 Unlike most late-type galaxies of the Virgo Cluster, M61 does not show a deficiency of neutral hydrogen〔 〕 Seven supernovae have been observed in this galaxy making it one of the most active Supernova galaxies known:〔(Supernovae which have been observed in Messier catalog galaxies )〕〔 (【引用サイトリンク】 title=List of Supernovae )〕〔(【引用サイトリンク】url=http://remanzacco.blogspot.it/2014/10/possible-supernova-in-m61-ngc-4303.html )〕 *SN 2014dt *SN 2008in *SN 2006ov *SN 1999gn *SN 1964F *SN 1961I *SN 1926A 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「Messier 61」の詳細全文を読む スポンサード リンク
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