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A new enigmatic radio relic in the low mass cluster Abell 2108 by Chatterjee, Swarna; Rahaman, Majidul; Datta, Abhirup; Kale, Ruta; Paul, Surajit is a scholarly article available to read on EtoBox.

What is A new enigmatic radio relic in the low mass cluster Abell 2108 about?

We report the discovery of a radio relic in the northeastern periphery of the cluster Abell 2108 (A2108). A2108 is a part of the uGMRT LOw-MAss Galaxy Cluster Survey (GLOMACS), where our main aim is to search for diffuse radio emission signatures in very sparsely explored low-mass galaxy clusters using uGMRT band-3 (central frequency 400 MHz). We used our uGMRT band-3 data along with the existing archival band-3 uGMRT data to improve image sensitivity. Along with the previously reported southwestern relic, the discovery of the new relic makes A2108 one of the few low-mass clusters hosting double relics. The new relic spans over a region of 610 kpc $\times$ 310 kpc and, interestingly, differs considerably in size and morphology from the other relic. With XMM-Newton science archive data, we also report the tentative detection of a mildly supersonic shock of Mach number $\mathcal{M}_\mathrm{SB}=1.42$ and $\mathcal{M}_\mathrm{T} = 1.43$ from the surface brightness and temperature discontinuities, respectively near this newly found relic. Both the relics in A2108 are found to be significantly under-luminous compared to other double relic systems in the mass-luminosity plane. Though mild

Author

Chatterjee, Swarna; Rahaman, Majidul; Datta, Abhirup; Kale, Ruta; Paul, Surajit

Published

2023

Language

EN