Observers examine a close-by galaxy cluster merger

Spectral separation symbol produced the use of a method associated with that of spectral tomography as a way to spotlight the flatter and steeper parts in CIZA0107. Credit score: arXiv (2024). DOI: 10.48550/arxiv.2412.15015

The usage of the Very Massive Array (VLA), a world crew of astronomers have noticed a close-by galaxy merger referred to as CIZA J0107.7+5408. Result of the observational marketing campaign, offered December 20 at the preprint server arXiv, may just assist us higher perceive the merging processes that happen between galaxy clusters.

Galaxy clusters comprise as much as hundreds of galaxies sure in combination by way of gravity. They typically shape on account of mergers and develop by way of accreting sub-clusters. Those processes supply a very good alternative to review subject in stipulations that can’t be explored in laboratories on Earth. Specifically, merging galaxy clusters may just assist us higher perceive the physics of outrage and chilly fronts observed within the diffuse intra-cluster medium, the cosmic ray acceleration in clusters, and the self-interaction houses of darkish subject.
At a redshift of roughly 0.1, CIZA J0107.7+5408, or CIZA0107 for brief, is a close-by, post-core passage, dissociative binary cluster merger. This can be a massive, kind of equivalent mass disturbed device consisting of 2 subclusters, website hosting two optical density peaks, with related however offset X-ray emission peaks.
A gaggle of astronomers led by way of Emma Schwartzmann of the U.S. Naval Analysis Laboratory in Washington, D.C., explored CIZA0107 with VLA, as a way to shed extra mild on its houses.
“We provide new 240–470 MHz and a pair of.0–4.0 GHz Very Massive Array observations of CIZA0107. We symbol the diffuse emission at prime solution, constrain its built-in spectrum, and map the spectral index distribution,” the researchers wrote within the paper.
The brand new VLA observations showed the complicated dynamical state of CIZA0107. The pictures display a dramatically disturbed merger device with a merger axis alongside the northeast–southwest course.

The observations at 340 MHz and three.0 GHz exhibit diffuse radio emission on a scale of about 1.6 million mild years in each and every of the 2 subclusters of CIZA0107. At 340 MHz, the astronomers additionally detected emission from two ultra-steep spectrum areas situated to the northwest and southeast of the diffuse radio emission height within the southwestern subcluster.
Moreover, the find out about discovered that the 2 subclusters have a equivalent spectral index of roughly -1.3. For the ultra-steep spectrum areas, the researchers measured steeper spectral slopes between 74 MHz and 340 MHz of about −2.2 and −2.9 for the northwestern and southeastern areas, respectively.
The observations additionally discovered that the diffuse emission related to the southwestern subcluster displays a pointy radio edge at 340 MHz. On the other hand, at 3.0 GHz the diffuse emission does no longer display any function on the location of the 340 MHz radio edge and X-ray surprise entrance, and in reality it extends past the surprise.
Summing up the consequences, the authors of the paper underlined that the houses of the emission in CIZA0107 counsel that the device would possibly host a double halo construction, or the emission could have its beginning in two relics projected at the central cluster areas.

Additional info:
Emma Schwartzman et al, Multi-frequency Radio Observations of the Dissociative Cluster Merger CIZA J0107.7+5408, arXiv (2024). DOI: 10.48550/arxiv.2412.15015

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