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NGC 4293
NGC 4293 is the ''New General Catalogue'' identifier for a lenticular galaxy in the northern constellation of Coma Berenices. It was discovered by English astronomer William Herschel on March 14, 1784, who described it as "large, extended, resolvable, 6 or 7′ long". This galaxy is positioned to the north-northwest of the star 11 Comae Berenices and is a member of the Virgo Cluster of galaxies.〔 It is assumed to lie at the same distance as the Virgo Cluster itself: around 54 million light years away.〔 The galaxy spans an apparent area of .〔
The morphological classification of NGC 4293 is (R)SB(s)0/a, with the SB0/a indicating this has just distinguishable tightly wound spiral arms with a bar structure at the nucleus. An '(s)' notation means that this galaxy does not have a ring-like structure around the nucleus.〔〔 Star formation within NGC 4293 is only taking place within a confined region at the center of the galaxy.〔 The outer stellar disk of the galaxy appears disturbed, suggesting some form of gravitational interaction.〔
This is a common type of active galaxy known as a LINER, which means that the optical spectrum is dominated by emission lines from gases in low energy ionization states. The activity may be the result of a supermassive black hole (SMBH) in the nucleus that is undergoing a low rate of matter accretion. The estimated mass of such an SMBH is M⊙.〔 Radio emission from thermal activity has been detected from the proximity of this object.〔
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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