Named after the British-born and Australia-based astronomer Paul Wild (1923–2008), who studied the trio in the early 1950s. Thus, the real group is also called Stephan's Quartet. The group is therefore more properly called HCG 92, because the name refers to a visual collection and not a group. There are actually only four galaxies in the compact group, the other galaxy is a foreground galaxy. Named after its discoverer, Édouard Stephan. HCG 79 lies 190 million light-years away in the Serpens Caput constellation. The group is, therefore, more properly called HCG 79 the name refers to the visual collection and not the group. ![]() The other "galaxy" is instead an extension of the interacting system - a tidal stream caused by the merger. One of the galaxies is an ungravitationally bound background object. There are actually only five galaxies in the sextet, and only four galaxies in the compact group. ![]() It is also called the NGC 6027 Sextet, after its brightest member. At the time it appeared to contain six external nebulae. Named after its discoverer, Carl Seyfert. This compact group of galaxies lies 160 million light-years away in the Phoenix constellation. Madore, who compiled A Catalogue of Southern Peculiar Galaxies and Associations in 1987. This stretch of galaxies forms part of the Virgo Cluster. This small group of galaxies lies in the constellation Leo. Named for the fact it contains only three galaxies. ĭiscovered by British astronomer Ralph Copeland in 1874.Ĭoined by Tom Lorenzin (author of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing") to honor Deer Lick Gap in the mountains of North Carolina, from which he had especially fine views of the galaxy group.Īlso referred to as the NGC 7331 Group, after the brightest member of the group. As of 2014, it was the lowest mass object that showed separation between the concentrations of dark matter and baryonic matter in the object. Named in comparison with the Bullet Cluster, being of similar formation, except smaller.Īlso has a systematic catalogue name SL2S J08544-0121. The galaxy group that includes the Milky Way. Named because the cluster resulted from a collision of clusters, which resulted in many different and strange phenomena.Īlso has a catalogue entry of Abell 2744. Named in comparison to the Bullet Cluster, as this one is older and slower galaxy cluster merger than the Bullet Cluster.Īlso has a systematic designation of DLSCL J0916.2+2951. The second most massive galaxy cluster next to El Gordo is RCS2 J2327, a galaxy cluster with the mass of 2 quadrillion suns.Īlso has a systematic designation of ACT-CL J0102-4915. Named for its size, El Gordo ("the fat one") is the biggest cluster found in the distant universe (at its distance and beyond), at the time of discovery in 2011, with a mass of 3 quadrillion suns. The cluster is named for the merger of two clusters colliding like a bullet.Īlso has a systematic designation of 1E 0657-56 This is a list of galaxy groups and clusters that are well known by something other than an entry in a catalog or list, or a set of coordinates, or a systematic designation. This is a recently coalesced merger of galaxy clusters, which has resulted in a ring of dark matter around the galaxies, yet to be redistributed. Ī collision between two massive, X-ray luminous galaxy clusters. The galaxies and the dark matter seems to have separated out into separate dark and light cores. This is actually a collision between two galaxy clusters. Some dark (since we don't see it), collision-less (or it would have been slowed, like the gas) matter is inferred to be present to account for the extra lensing around otherwise low-mass regions. Yet the regions with the stars show more gravitational lensing than the gas region, indicating that they are more massive than the gas. The gas dominates the visible mass budget of the clusters, being several times more massive than all the stars. In this collision between two clusters of galaxies, the stars pass between each other unhindered, while the hot, diffuse gas experiences friction and is left behind between the clusters. Some clusters exhibiting strong evidence of dark matter. ![]() In particular, clusters close to the Milky Way tend to be classified as galaxy clusters even when they are much smaller than more distant clusters.Ĭlusters exhibiting strong evidence of dark matter This article lists some galaxy groups and galaxy clusters.ĭefining the limits of galaxy clusters is imprecise as many clusters are still forming. ![]() Abell 2744 galaxy cluster - Hubble Frontier Fields view (7 January 2014)
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