MeerKAT's discovery of a radio relic in the bimodal merging cluster A2384. Issue 1 (21st September 2020)
- Record Type:
- Journal Article
- Title:
- MeerKAT's discovery of a radio relic in the bimodal merging cluster A2384. Issue 1 (21st September 2020)
- Main Title:
- MeerKAT's discovery of a radio relic in the bimodal merging cluster A2384
- Authors:
- Parekh, V
Thorat, K
Kale, R
Hugo, B
Oozeer, N
Makhathini, S
Kleiner, D
White, S V
Józsa, G I G
Smirnov, O
van der Heyden, K
Perkins, S
Andati, L
Ramaila, A
Ramatsoku, M - Abstract:
- ABSTRACT: We present the discovery of a single radio relic located at the edge of the galaxy cluster A2384, using the MeerKAT radio telescope. A2384 is a nearby ( z = 0.092), low-mass, complex bimodal, merging galaxy cluster that displays a dense X-ray filament (∼700 kpc in length) between A2384(N; northern cluster) and A2384(S; southern cluster). The origin of the radio relic is puzzling. Using the MeerKAT observation of A2384, we estimate that the physical size of the radio relic is 824 × 264 kpc 2 and that it is a steep spectrum source. The radio power of the relic is $P_{1.4\mathrm{GHz}}\, \sim$ (3.87 ± 0.40) × 10 23 W Hz −1 . This radio relic could be the result of shock wave propagation during the passage of the low-mass A2384(S) cluster through the massive A2384(N) cluster, creating a trail appearing as a hot X-ray filament. In the previous GMRT 325 MHz observation, we detected a peculiar FR I radio galaxy interacting with the hot X-ray filament of A2384, but the extended radio relic was not detected; it was confused with the southern lobe of the FR I galaxy. This newly detected radio relic is elongated and perpendicular to the merger axis, as seen in other relic clusters. In addition to the relic, we notice a candidate radio ridge in the hot X-ray filament. The physical size of the radio ridge source is ∼182 × 129 kpc 2 . Detection of the diffuse radio sources in the X-ray filament is a rare phenomenon, and could be a new class of radio source found between the twoABSTRACT: We present the discovery of a single radio relic located at the edge of the galaxy cluster A2384, using the MeerKAT radio telescope. A2384 is a nearby ( z = 0.092), low-mass, complex bimodal, merging galaxy cluster that displays a dense X-ray filament (∼700 kpc in length) between A2384(N; northern cluster) and A2384(S; southern cluster). The origin of the radio relic is puzzling. Using the MeerKAT observation of A2384, we estimate that the physical size of the radio relic is 824 × 264 kpc 2 and that it is a steep spectrum source. The radio power of the relic is $P_{1.4\mathrm{GHz}}\, \sim$ (3.87 ± 0.40) × 10 23 W Hz −1 . This radio relic could be the result of shock wave propagation during the passage of the low-mass A2384(S) cluster through the massive A2384(N) cluster, creating a trail appearing as a hot X-ray filament. In the previous GMRT 325 MHz observation, we detected a peculiar FR I radio galaxy interacting with the hot X-ray filament of A2384, but the extended radio relic was not detected; it was confused with the southern lobe of the FR I galaxy. This newly detected radio relic is elongated and perpendicular to the merger axis, as seen in other relic clusters. In addition to the relic, we notice a candidate radio ridge in the hot X-ray filament. The physical size of the radio ridge source is ∼182 × 129 kpc 2 . Detection of the diffuse radio sources in the X-ray filament is a rare phenomenon, and could be a new class of radio source found between the two merging clusters of A2384(N) and A2384(S). … (more)
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 499:Issue 1(2020)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 499:Issue 1(2020)
- Issue Display:
- Volume 499, Issue 1 (2020)
- Year:
- 2020
- Volume:
- 499
- Issue:
- 1
- Issue Sort Value:
- 2020-0499-0001-0000
- Page Start:
- 404
- Page End:
- 414
- Publication Date:
- 2020-09-21
- Subjects:
- galaxies: clusters: intracluster medium -- radio continuum: general
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/staa2795 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 15079.xml