Research topic:Virgo

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Virgo Cluster

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

Virgo Cluster The nearest large cluster of galaxies, and the centre of the local supercluster. It is an irregular, roughly elliptical cluster of over 2000 galaxies, the brightest of which are within the reach of amateur telescopes. Its distance is approximately 55 million l.y., and its diameter 9 million l.y. The cluster spans 12 ° of sky, spilling northwards over the border of Virgo into Coma Berenices; hence it is sometimes also known as the Coma–Virgo Cluster, but should not be confused with the separate Coma Cluster, which is considerably more distant. The Virgo Cluster has a comparatively high proportion of spirals, many dwarf galaxies, and a mass of 2 to 5 × 1014 solar masses. The four brightest members, all ellipticals, are M49 (NGC 4472), M87 (NGC 4486, a giant elliptical galaxy with an unusual jet emanating from its nucleus), M60 (NGC 4649), and M86 (NGC 4406). There is evidence of a slight asymmetry in redshifts between the spirals and the ellipticals, suggesting that the cluster is in fact two clusters superimposed along the line of sight.

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Related entries from encyclopedias, dictionaries, and thesauruses

Virgo
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Virgo Cluster
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Virgo A
Book article from: A Dictionary of Astronomy Virgo A A strong radio source in the constellation Virgo, identified with the 9th-magnitude giant elliptical galaxy...also known as NGC 4486), lying near the centre of the Virgo Cluster of galaxies about 55 million l.y. away. It is...
Coma–Virgo Cluster
Book article from: A Dictionary of Astronomy Coma–Virgo Cluster See virgo cluster .
Virgo Supercluster
Book article from: A Dictionary of Astronomy Virgo Supercluster An alternative name for the local supercluster .

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