This is a Shot of M84, M86 and NGC4402. M84 (lower right) and M86 (lower on the left) are both giant lenticular galaxies at the heart of the Virgo cluster of Galaxies.
Located in Markarian's Chain, M84 was studied by the Hubble Space Telescope in 1997 and was found to contain a massive central object, estimated at 300 million solar masses, located less than 26 light years from the center of the galaxy.
NGC 4402, a spiral galaxy at the top of the photo, appears Almost completely edge on to the Milky Way. There are lots of little "fuzzies" in the background that are other members of the cluster .
Located about 70 million light years away, the Virgo cluster is a gigantic collection of several thousand galaxies that dominate our local part of the universe.
The Virgo Cluster is a cluster of galaxies whose center is 53.8 ± 0.3 Mly (16.5 ± 0.1 Mpc) away in the constellation Virgo. Comprising approximately 1300 (and possibly up to 2000) member galaxies, the cluster forms the heart of the larger Local Supercluster, of which the Local Group is an outlying member. It is estimated that its mass is 1.2×1015 M☉ out to 8 degrees of the cluster's center or a radius of about 2.2 Mpc.
Many of the brighter galaxies in this cluster, including the giant elliptical galaxy Messier 87, were discovered in the late 1770s and early 1780s and subsequently included in Charles Messier's catalogue of non-cometary fuzzy objects. Described by Messier as nebulae without stars, their true nature was not recognized until the 1920s.
The cluster subtends a maximum arc of approximately 8 degrees centered in the constellation Virgo. Many of the member galaxies of the cluster are visible with a small telescope.
The cluster is a fairly heterogeneous mixture of spirals and ellipticals.As of 2004, it is believed that the spirals of the cluster are distributed in an oblong prolate filament, approximately 4 times as long as wide, stretching along the line of sight from the Milky Way. The elliptical galaxies are more centrally concentrated than the spiral galaxies.
The cluster is an aggregrate of at least three separate subclumps centered on the galaxies M87, M86, and M49. Of the three subclumps, the one centered on M87 is the dominant one, with a mass of approximately 1014 solar masses, which is approximately an order of magnitude larger than the other two subclumps.
The large mass of the cluster is indicated by the high peculiar velocities of many of its galaxies, sometimes as high as 1,600 km/s with respect to the cluster's center.
The Virgo cluster lies within the Local Supercluster, and its gravitational effects slow down the nearby galaxies. The large mass of the cluster has the effect of slowing down the recession of the Local Group from the cluster by approximately ten percent.
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Last edited by Dave Lane; 04-10-2011 at 06:27 PM..