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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/30478
Title: Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931
Authors: 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.
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 477
Issue: 3
First Page: 3461
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.
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: 0035-8711
DOI: 10.1093/mnras/sty851
Bibcode ADS: 2018MNRAS.477.3461B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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