BROWSE

Related Researcher

Author's Photo

Ryu, Dongsu
Astrophysics Lab
Research Interests
  • Shock waves and turbulence in clusters of galaxies
  • Origin and evolution of magnetic fields and cosmic rays in the universe
  • Plasma astrophysical phenomena in the large-scale structure of the universe

ITEM VIEW & DOWNLOAD

Radio and x-ray shocks in clusters of galaxies

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Radio and x-ray shocks in clusters of galaxies
Author
Hong, Sungwook E.Kang, HyesungRyu, Dongsu
Issue Date
2015-10
Publisher
IOP PUBLISHING LTD
Citation
ASTROPHYSICAL JOURNAL, v.812, no.1, pp.49
Abstract
Radio relics detected in the outskirts of galaxy clusters are thought to trace radio-emitting relativistic electrons accelerated at cosmological shocks. In this study, using the cosmological hydrodynamic simulation data for the large-scale structure formation and adopting a diffusive shock acceleration (DSA) model for the production of cosmic-ray (CR) electrons, we construct mock radio and X-ray maps of simulated galaxy clusters that are projected in the sky plane. Various properties of shocks and radio relics, including the shock Mach number, radio spectral index, and luminosity, are extracted from the synthetic maps and compared with observations. A substantial fraction of radio and X-ray shocks identified in these maps involve multiple shock surfaces along lines of sight (LOSs), and the morphology of shock distributions in the maps depends on the projection direction. Among multiple shocks in a given LOS, radio observations tend to pick up stronger shocks with flatter radio spectra, while X-ray observations preferentially select weaker shocks with larger kinetic energy flux. As a result, in some cases the shock Mach numbers and locations derived from radio and X-ray observations could differ from each other. We also find that the distributions of the spectral index and radio power of the synthetic radio relics are somewhat inconsistent with those of observed real relics; a bit more radio relics have been observed closer to the cluster core and with steeper spectral indices. We suggest that the inconsistency could be explained if very weak shocks with M-s less than or similar to 2 accelerate CR electrons more efficiently, compared with the DSA model adopted here.
URI
https://scholarworks.unist.ac.kr/handle/201301/17871
URL
http://iopscience.iop.org/article/10.1088/0004-637X/812/1/49/meta
DOI
10.1088/0004-637X/812/1/49
ISSN
0004-637X
Appears in Collections:
PHY_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU