The coma center of mass explored using AstroSat

The coma center of mass explored using AstroSat

Sloan Digital Sky Survey/Spitzer Space Telescope mosaic of coma range in long-wavelength infrared (red), short-wavelength infrared (green) and visible light. Credit: NASA/JPL-Caltech/L. Jenkins (GSFC).

Using the Indian spacecraft AstroSat, astronomers have investigated the central field of a group of galaxies known as the Coma cluster. The results of the study, presented in a research paper published September 13 on, provide important insights into the properties and nature of this group of galaxies.

Galactic clusters contain up to thousands of galaxies bound together by gravity. They are the largest known gravitationally bound structures in the universe, and can serve as excellent laboratories for studying the evolution of galaxies and cosmology.

At a distance of about 321 million light years, the Coma cluster (also known as Abell 1656) is one of the richest and most well-studied clusters of galaxies in the nearby universe. It contains more than 1,000 galaxies and its central region is dominated by two giant giants elliptical galaxiesThey are: NGC 4874 and NGC 4889.

In order to shed more light on the characteristics of this group, a team of Astronomy scientists Led by Smriti Mahajan of the Indian Institute of Science Education and Research in Mohali, India, monitor it with AstroSat. For this purpose, they mainly used the Ultraviolet Imaging Telescope (UVIT) satellite to conduct a far ultraviolet study of the central region of the Coma cluster.

“We present an analysis of far ultraviolet (FUV) emissions in the central region of the Coma cluster (z = 0.023) using data captured by UVIT aboard the AstroSat multi-wavelength satellite mission,” the researchers wrote in the paper. .

First of all, the team examined a deep-field far UV image of the Coma cluster (a region with a radius of about 2.3 million light-years from the cluster’s core) and discovered more than 1,300 sources. It was noted that 852 of these sources have been identified as galaxies, 114 as stars, and three as quasars (one of which is the farthest thing UVIT has observed so far). The nature of the remaining sources has not yet been determined.

The study found that most of the brightest galaxies identified by UVIT are members of the coma cluster. Furthermore, it turns out that many of the 852 galaxies exhibit an atypical ultraviolet ray. For example, the particular galaxy GMP 2910, which shows an astonishing narrow tail, presumably composed of a dwarf galaxy or a gas cloud disrupted by ram pressure stripping by average intraclusteror tidal forces.

Astronomers generally hypothesize that sources identified by UVIT that display distorted morphology, may have recently entered the coma cluster, and are therefore undergoing stripping events under the influence of cluster-related environmental mechanisms.

“It is possible that all the distorted sources have fallen into the block recently, and therefore have not yet been activated,” the paper’s authors explained.

To the best of their knowledge, they added, their study is the first investigation of the galaxy cluster field to be made using UVIT data.

Researchers explore open cluster NGC 2506 with AstroSat

more information:
Smriti Mahajan et al., Deepest far ultraviolet view of a central field in the coma mass by AstroSat UVIT. arXiv: 2209.05886v1 [astro-ph.GA]And the

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