The source near the center at RA (1950) 12 h56 m ± 2 m Dec 28☆' ± 12' has a luminosity L x = 2.6 x 10 44 ergs/s. The Coma cluster contains about 800 galaxies within a 100 x 100 arc-min area of the celestial sphere. A strong X-ray source was observed by the X-ray observatory satellite Uhuru close to the center of the Coma cluster and this source was suggested to be designated Coma X-1. This X-ray observation was performed by balloon, but the source was not detected in the sounding rocket flight launched by the X-ray astronomy group at the Naval Research Laboratory on November 25, 1964. X-ray source Īn extended X-ray source centered at 1300+28 in the direction of the Coma cluster of galaxies was reported before August 1966. The distribution of dark matter throughout the cluster, however, is poorly constrained. Ībout 90% of the mass of the Coma cluster is believed to be in the form of dark matter. Though the idea of dark matter would not be accepted for another fifty years, Zwicky wrote that the galaxies must be held together by " dunkle Materie" (dark matter). In 1933 Fritz Zwicky showed that the galaxies of the Coma Cluster were moving too fast for the cluster to be bound together by the visible matter of its galaxies. The Coma Cluster is one of the first places where observed gravitational anomalies were considered to be indicative of unobserved mass.
#Coma x ray full#
The full extent of the cluster was not understood until it was more thoroughly studied in the 1950s by astronomers at Mount Palomar Observatory, although many of the individual galaxies in the cluster had been identified previously. Īs is usual for clusters of this richness, the galaxies are overwhelmingly elliptical and S0 galaxies, with only a few spirals of younger age, and many of them probably near the outskirts of the cluster. Tails in spiral galaxy D100, found in the Coma Cluster, are created by ram-pressure stripping. Both dwarf and giant ellipticals are found in abundance in the Coma Cluster. Most of the galaxies that inhabit the central portion of the Coma Cluster are ellipticals. The cluster is within a few degrees of the north galactic pole on the sky. The central region is dominated by two supergiant elliptical galaxies: NGC 4874 and NGC 4889. Its ten brightest spiral galaxies have apparent magnitudes of 12–14 that are observable with amateur telescopes larger than 20 cm. The cluster's mean distance from Earth is 99 Mpc (321 million light years).
![coma x ray coma x ray](https://arxiver.moonhats.com/wp-content/uploads/2020/12/ChurazovEtAl-2012.11627_f17.jpg)
![coma x ray coma x ray](https://snowbrains.com/wp-content/uploads/2019/11/HAPE-lung-optmized.png)
It is located in and takes its name from the constellation Coma Berenices. Along with the Leo Cluster (Abell 1367), it is one of the two major clusters comprising the Coma Supercluster. The Coma Cluster ( Abell 1656) is a large cluster of galaxies that contains over 1,000 identified galaxies. See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters The many faint green smudges are dwarf galaxies in the cluster. A Sloan Digital Sky Survey/ Spitzer Space Telescope mosaic of the Coma Cluster in long-wavelength infrared (red), short-wavelength infrared (green), and visible light.