European astronomers observed a galaxy cluster known as Abell 1213 using several spacecraft and ground-based facilities. The observations revealed key information about the radio emission propagating from this source. The findings are reported in a paper published March 4 in arXiv Prepress server.
Galaxy clusters contain up to thousands of galaxies bound together by gravity. They are the largest known gravitationally bound structures in the universe, and they can serve as excellent laboratories for the study of galactic evolution and cosmology.
At a redshift of 0.047, Abell 1213 is a weak low mass galaxy cluster Its central region is dominated by the radio galaxy 4C29.41 and two others radio galaxies. Previous observations of this cluster found it to host a radio source presumed to be a small-sized radio corona—a low-brightness diffuse synchrotron source.
A team of astronomers led by Walter Boeshin of the University of Laguna, Spain, analyzed a huge set of data from space telescopes and ground-based observatories in order to shed more light on the characteristics of Abell 1213, and the nature of its radio. source and diffuse emission from it.
We used optical SDSS data to study the internal dynamics of the cluster. We also analyzed archived XMM-Newton X-ray data to unveil the properties of the hot inner cluster medium. Finally we used recent LOFAR data at 144 MHz, along with VLA data at 1.4 GHz to study the behavior. Spectroscopy of a Spread Radio Source”.
First of all, the observations found that Abell 1213 displays turbulent dynamics as the brightest cluster galaxy (BCG) has an oddly large velocity. The results indicate that Abell 1213 is composed of several galaxy clusters and that its core is quite complex. Moreover, it was found that blue star-forming galaxies are not limited to the peripheral regions of Abell 1213, which seems to indicate that the cluster formed through the accumulation of many poor clusters rich in Late-type galaxies.
Radio observations of Abell 1213 show that the volume of the scattered radio emission is about 1.66 million light years. However, it turns out that this radio emission does not follow the X-ray emission. Therefore, the extended source may not be a radio corona, but rather the center tail radio galaxy 4C29.41 is bent by interaction with intracluster medium (ICM). Furthermore, the data provided some evidence for fragmented diffuse radio emissions in the center of mass whose nature is uncertain.
The astronomers also hypothesize that the source of the radio emission in Abell 1213 may be radio remnants, so the “fossil” electrons of 4C29.41 are shock-accelerated by the merger. They argue that the spectral index distribution supports this hypothesis.
“The spectral index map of the radio source with the interpretation of residuals, possibly due to mergers in the NS or NE-SW direction, is in agreement with the subcompositions detected by optical analysis. The radio emissions are fragmented and scattered in the cluster. The center could be the peaks of the surface brightness of the radio corona faint centrality.”
The paper’s authors note that the X-rays are deeper Notes Abell 1213 is necessary in order to draw final conclusions regarding the nature of the spread radio emission.
W. Pusheen et al., Optical/X-ray/radio view of Abell 1213: a galaxy cluster with anomalous diffuse radio emission, arXiv (2023). 220.127.116.11/abs/2303.02528
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