Study sheds more light on the diffuse radio emission from the galaxy cluster Abell 1213

European astronomers have noticed a galaxy cluster generally known as Abell 1213 utilizing numerous spacecraft and ground-based amenities. The observations unveiled important details about the diffuse radio emission from this supply. The findings are reported in a paper printed March 4 on the arXiv pre-print server.

Galaxy clusters include as much as hundreds of galaxies sure collectively by gravity. They’re the biggest recognized gravitationally sure buildings within the universe, and will function wonderful laboratories for learning galaxy evolution and cosmology.

At a redshift of 0.047, Abell 1213 is a poor low-mass galaxy cluster dominated in its central area by the radio galaxy 4C29.41 and two different radio galaxies. Earlier observations of this cluster have discovered that it hosts a radio supply assumed to be a small-sized radio halo—a diffuse, low-surface brightness synchrotron supply.

A staff of astronomers led by Walter Boschin of the College of La Laguna, Spain, has analyzed an enormous set of information from space telescopes and ground-based observatories as a way to shed extra mild on the properties of Abell 1213, the character of its radio supply and the diffuse emission from it.

“We used optical SDSS knowledge to review the inner dynamics of the cluster. We additionally analyzed archival XMM-Newton X-ray knowledge to unveil the properties of its scorching intracluster medium. Lastly we used current LOFAR knowledge at 144 MHz, along with VLA knowledge at 1.4 GHz, to review the spectral habits of the diffuse radio supply,” the researchers wrote within the paper.

To begin with, the observations discovered that Abell 1213 reveals disturbed dynamics as its brightest cluster galaxy (BCG) has a really vital peculiar velocity. The outcomes recommend that Abell 1213 consists of a number of galaxy teams and its core is sort of intricate. Moreover, it was discovered that blue, star-forming galaxies are usually not restricted to the peripheral areas of Abell 1213, which appears to point that the cluster was fashioned by means of accretion of a number of poor teams wealthy in late-type galaxies.

Radio observations of Abell 1213 present that the diffuse radio emission has a measurement of about 1.66 million light years. Nevertheless, it turned out that this radio emission doesn’t observe the X-ray emission. Due to this fact, the prolonged supply could also be not a radio halo, however a tail of the central radio galaxy 4C29.41 bent by the interplay with the intracluster medium (ICM). Furthermore, the info offered some proof of fragmented diffuse radio emissions on the cluster heart whose nature is unsure.

The astronomers additionally suppose that the supply of radio emission in Abell 1213 could also be a radio relic, therefore “fossil” electrons of 4C29.41 are reaccelerated by shock attributable to a merger. They argue that the spectral index distribution helps this speculation.

“The spectral index map of the radio supply is suitable with a relic interpretation, probably attributable to a merger within the N-S or NE-SW route, in settlement with the substructures detected by means of the optical evaluation. The fragmented, diffuse radio emissions on the cluster heart might be the floor brightness peaks of a faint central radio halo,” the researchers defined.

The authors of the paper famous that deeper X-ray observations of Abell 1213 are mandatory as a way to draw closing conclusions concerning the character of its diffuse radio emission.

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