NGC 4550
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NGC 4550 is a barred lenticular galaxy located in the constellation of Virgo that can be seen with amateur telescopes. It's at a distance of 50 million light-years (15.5 mega parsecs) from the Milky Way and is a member of the Virgo Cluster[2]
Physical characteristics
While NGC 4550 is not one of the brightest galaxies of the Virgo Cluster, its notable as it's one of the few galaxies where a large amount of its stars rotate around the galaxy's center in opposite direction to the others[3] (another, brighter, example is the spiral galaxy NGC 7217). The stars of this galaxy are concentrated in two disks of similar size and surface brightness, one nested within the other[3] and it has been suggested it's the product of the merger between two previous disk galaxies, each one counter-rotating with respect to the other.[4]
NGC 4550's center also shows a small amount of molecular hydrogen and interstellar dust,[3] the latter concentrated in a disk surrounding its core[5] where star formation is taking place albeit at a very modest level.[4]
References
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