Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:1701.06742)
· References in the article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
A study of halo and relic radio emission in merging clusters using the Murchison Widefield Array
Authors:
George, L. T.; Dwarakanath, K. S.; Johnston-Hollitt, M.; Intema, H. T.; Hurley-Walker, N.; Bell, M. E.; Callingham, J. R.; For, Bi-Qing; Gaensler, B.; Hancock, P. J.; Hindson, L.; Kapinska, A. D.; Lenc, E.; McKinley, B.; Morgan, J.; Offringa, A.; Procopio, P.; Staveley-Smith, L.; Wayth, R. B.; Wu, Chen; Zheng, Q.
Affiliation:
AA(Raman Research Institute, Bangalore 560080, India), AB(Raman Research Institute, Bangalore 560080, India), AC(School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand), AD(Leiden University, PO Box 9500, NL-2300 RA Leiden, the Netherlands), AE(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AF(CSIRO Astronomy and Space Science (CASS), PO Box 76, Epping, NSW 1710, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), 44 Rosehill Street, Redfern, NSW 2016, Australia), AG(CSIRO Astronomy and Space Science (CASS), PO Box 76, Epping, NSW 1710, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), 44 Rosehill Street, Redfern, NSW 2016, Australia; Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006, Australia), AH(International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia), AI(Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006, Australia), AJ(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), 44 Rosehill Street, Redfern, NSW 2016, Australia), AK(Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK), AL(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), 44 Rosehill Street, Redfern, NSW 2016, Australia; International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia), AM(Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006, Australia), AN(School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia), AO(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AP(ASTRON, NL-7990 AA Dwingeloo, the Netherlands), AQ(School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia), AR(International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia), AS(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), 44 Rosehill Street, Redfern, NSW 2016, Australia), AT(International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia), AU(School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 467, Issue 1, p.936-949 (MNRAS Homepage)
Publication Date:
05/2017
Origin:
OUP
Astronomy Keywords:
acceleration of particles: radiation mechanisms, galaxies: clusters: general, galaxies: clusters: intracluster medium, techniques: interferometric, radio continuum: general, X-rays: galaxies: clusters, radiation mechanisms: non-thermal
Abstract Copyright:
2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stx155
Bibliographic Code:
2017MNRAS.467..936G

Abstract

We have studied radio haloes and relics in nine merging galaxy clusters using the Murchison Widefield Array (MWA). The images used for this study were obtained from the GaLactic and Extragalactic All-sky MWA (GLEAM) Survey which was carried out at five frequencies, viz. 88, 118, 154, 188 and 215 MHz. We detect diffuse radio emission in eight of these clusters. We have estimated the spectra of haloes and relics in these clusters over the frequency range 80-1400 MHz; the first such attempt to estimate their spectra at low frequencies. The spectra follow a power law with a mean value of alpha = -1.13 ± 0.21 for haloes and alpha = -1.2 ± 0.19 for relics, where S ∝ nualpha. We reclassify two of the cluster sources as radio galaxies. The low-frequency spectra are thus an independent means of confirming the nature of cluster sources. Five of the nine clusters host radio haloes. For the remaining four clusters, we place upper limits on the radio powers of possible haloes in them. These upper limits are a factor of 2-20 below those expected from the LX-P1.4 relation. These limits are the lowest ever obtained and the implications of these limits to the hadronic model of halo emission are discussed.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

  New!

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints