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NGC 4402 is a relatively near, edge-on spiral galaxy located around 55 million light-years from Earth. It is in the constellation of Virgo within the Virgo Cluster of galaxies. It can be seen when viewing Markarian's Chain. NGC 4402 is roughly 55 thousand light-years wide and is moving away from Earth at around 232 kilometers per second. It is falling into the Virgo galaxy cluster. Images show evidence that the material it once contained to enable it to form stars has been stripped away in a process known as "ram-pressure stripping". This is due to NGC 4402's cooler gasses being struck by hot x-ray gasses coming from the middle of the Virgo galaxy cluster as it moves toward it. The evidence is as follows:〔(【引用サイトリンク】title=National Optical Astronomy Observatory )〕〔(【引用サイトリンク】title=NGC 4402, an edge-on spiral galaxy in Virgo - Anne's Astronomy News )〕 〔(【引用サイトリンク】title=NOAO Press Release 04-06: Galaxy Cleaned Out by Encounter with Hot Cluster Gas )〕 *There is apparent truncation of the NGC 4402's dust disk. *An upward ''bowing'' of the dusty disk is apparent. This is caused by a ''wind'' of hot gas. *Light coming from the far side of the stellar disk appears dim and reddish. This may be because pressure coming from the cluster gas is being forced between the disk and the observer. *The bottom part of the main disk shows dust in the form of linear filaments. These are being ablated in a characteristic "outside-in" manner. The supernova SN 1976B was observed in NGC 4402 in 1976.〔〔 ==Gallery== File:ESO-M87.jpg|NGC 4402 and other galaxies viewed through the Burrell Schmidt telescope. The black circles were put there to remove bright, foreground stars. File:MarkariansHunterWilson.jpg|NGC 4402 visible in an image of Markarian's Chain. Click the image then move the cursor over it to reveal the location of NGC 4402. File:Ngc4402-hst-R814G606B435.jpg|NGC 4402 with color rendering 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「NGC 4402」の詳細全文を読む スポンサード リンク
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