![]() In particular, we identify a faint X-ray bridge connecting the group with the cluster, which is convincing proof that NGC 4839 has already crossed the main cluster. In this study, we discuss the rich morphology revealed by the X-ray observations (also in combination with the SZ data) and argue that the most salient features can be naturally explained by a recent (on-going) merger with the NGC 4839 group. The stability of the instrumental background and operation of the SRG Observatory in the scanning mode provided us with an excellent data set for studies of the diffuse emission up to a distance of $\sim 1.5R_$ from the Coma center. The data cover $\sim3^\circ\times 3^\circ$ area around the cluster with a typical exposure time of more than 20 ks. Churazov and 4 other authors Download PDF Abstract:This is the first paper in a series of studies of the Coma cluster using the SRG/eROSITA X-ray data obtained in course of the Calibration and Performance Verification observations. X-ray morphology, recent merger, and radio halo connection, by E. 1365-1368 doi: 10.1126/science.Download a PDF of the paper titled Tempestuous life beyond R_500: X-ray view on the Coma cluster with SRG/eROSITA. Linear Structures in the Core of the Coma Cluster of Galaxies. The findings appear online in the journal Science ( version).īibliographic information: J. A very thin tail also appears behind one of the galaxies in Coma. One or both of these arms connects to a larger structure and spans a distance or at least 1.5 million light years. Two of the arms appear to be connected to a group of galaxies located about two million light years from the center of Coma. The team has found a range of answers, some of them conflicting, and so observations of other clusters are needed. Estimating the amount of turbulence in a galaxy cluster has been a challenging problem for astrophysicists. Large-scale magnetic fields are likely responsible for the small amount of turbulence that is present in Coma. Instead, the smooth shape of these lengthy arms points to a rather calm setting for the hot gas in the Coma cluster, even after many mergers. Most theoretical models expect that mergers between clusters like those in Coma will produce strong turbulence, like ocean water that has been churned by many passing ships. This gives the researchers some clues about the conditions of the hot gas in Coma. The scientists say that these arms were most likely formed when smaller galaxy clusters had their gas stripped away by the head wind created by the motion of the cluster through the hot gas, in much the same way that the headwind created by a roller coaster blows the hats off riders.įrom their length, and the speed of sound in the hot gas, the arms are estimated to be about 300 million years old, and they appear to have a rather smooth shape. Their discovery provides insight into how the Coma cluster has grown through mergers of smaller groups and clusters of galaxies to become one of the largest structures in the Universe held together by gravity. The newly discovered arms span at least half a million light years. These galaxies are probably the vestiges from each of the two largest clusters that merged with Coma in the past. optical – SDSS.Ĭoma is an unusual galaxy cluster because it contains not one, but two giant elliptical galaxies near its center. Image credit: X-ray – NASA / CXC / MPE / J. ![]() This composite image shows enormous arms of plasma in the Coma galaxy cluster. ![]()
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