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  5. Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931
 

Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931

Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY  
Date Issued
2018
Author(s)
Brüggen, M.
•
Rafferty, D.
•
Bonafede, A.  
•
van Weeren, R. J.
•
Shimwell, T.
•
Intema, H.
•
Röttgering, H.
•
BRUNETTI, GIANFRANCO  
•
Di Gennaro, G.
•
Savini, F.
•
Wilber, A.
•
O'Sullivan, S.
•
Ensslin, T. A.
•
De Gasperin, F.  
•
Hoeft, M.
DOI
10.1093/mnras/sty851
Abstract
Extended, steep-spectrum radio synchrotron sources are pre-dominantly found in massive galaxy clusters as opposed to groups. LOFAR Two-Metre Sky Survey images have revealed a diffuse, ultra-steep spectrum radio source in the low-mass cluster Abell 1931. The source has a fairly irregular morphology with a largest linear size of about 550 kpc. The source is only seen in LOFAR observations at 143 MHz and GMRT observations at 325 MHz. The spectral index of the total source between 143 MHz and 325 MHz is $\alpha_{143}^{325} = -2.86 \pm 0.36$. The source remains invisible in Very Large Array (1-2 GHz) observations as expected given the spectral index. Chandra X-ray observations of the cluster revealed a bolometric luminosity of $L_X = (1.65 \pm 0.39) \times 10^{43}$ erg s$^{-1}$ and a temperature of $2.92_{-0.87}^{+1.89}$ keV which implies a mass of around $\sim 10^{14} M_{\odot}$. We conclude that the source is a remnant radio galaxy that has shut off around 200 Myr ago. The brightest cluster galaxy, a radio-loud elliptical galaxy, could be the source for this extinct source. Unlike remnant sources studied in the literature, our source has a steep spectrum at low radio frequencies. Studying such remnant radio galaxies at low radio frequencies is important for understanding the scarcity of such sources and their role in feedback processes.
Volume
477
Issue
3
Start page
3461
Uri
http://hdl.handle.net/20.500.12386/30478
Url
http://arxiv.org/abs/1804.01099v1
https://academic.oup.com/mnras/article/477/3/3461/4962398
Issn Identifier
0035-8711
Ads BibCode
2018MNRAS.477.3461B
Rights
open.access
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