File:Hubble spies NGC 4394.jpg
原始文件 (1,280 × 1,381像素,文件大小:461 KB,MIME类型:image/jpeg)
摘要
描述Hubble spies NGC 4394.jpg |
English: Discovered in 1784 by the German–British astronomer William Herschel, NGC 4394 is a barred spiral galaxy situated about 55 million light-years from Earth. The galaxy lies in the constellation of Coma Berenices (Berenice's Hair), and is considered to be a member of the Virgo Cluster.
NGC 4394 is the archetypal barred spiral galaxy, with bright spiral arms emerging from the ends of a bar that cuts through the galaxy’s central bulge. These arms are peppered with young blue stars, dark filaments of cosmic dust, and bright, fuzzy regions of active star formation. At the centre of NGC 4394 lies a region of ionised gas known as a LINER. LINERs are active regions that display a characteristic set of emission lines in their spectra— mostly weakly ionised atoms of oxygen, nitrogen and sulphur. Although LINER galaxies are relatively common, it’s still unclear where the energy comes from to ionise the gas. In most cases it is thought to be the influence of a black hole at the centre of the galaxy, but it could also be the result of a high level of star formation. In the case of NGC 4394, it is likely that gravitational interaction with a nearby neighbour has caused gas to flow into the galaxy’s central region, providing a new reservoir of material to fuel the black hole or to make new stars. |
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来源 | http://www.spacetelescope.org/images/potw1618a/ |
作者 |
ESA/Hubble & NASA Acknowledgement: Judy Schmidt (Geckzilla) |
许可协议
ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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2 5 2016
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提供者 | ESA/Hubble & NASA Acknowledgement: Judy Schmidt (Geckzilla) |
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来源 | ESA/Hubble |
简短标题 |
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图像标题 |
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使用条款 |
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数据生成日期时间 | 2016年5月2日 (一) 06:00 |
使用软件 | Adobe Photoshop CC 2014 (Windows) |
原始文件唯一ID | xmp.did:8801a5d9-8127-db4b-87b9-68413f59f278 |
关键词 | NGC 4394 |
联系信息 |
http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
IIM版本 | 4 |