Abstract Details
| Name: Lijo T George Affiliation: Raman Research Institute Conference ID: ASI2015_579 Title : MWA Observations of the galaxy cluster Abell 3376 Authors and Co-Authors : K. S. Dwarakanath (RRI), N. Hurley-Walker (Curtin), M. Johnson-Holitt (Victoria University of Wellington), L. Hindson (VUW), GLEAM Survey members, MWA Builders List Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : Diffuse radio emission from galaxy clusters is detected in the form of central halos and/or in the form of peripheral relics. Clusters which show signs of merger activity are most likely to host these halos and/or relics. The galaxy cluster Abell 3376 (z = 0.046) contains two arc-like structures separated by ∼2 Mpc and is a brilliant candidate for “double relics†which are believed to trace the shocks travelling outward in the aftermath of a merger. This cluster was observed using the MWA as part of the GLEAM survey. The data from the GLEAM survey at multiple frequencies (88, 118, 154, 215 MHz) were analysed and imaged using the CASA software. We were able to detect both the relics at all the frequencies. At 150 MHz we achieved a resolution of 3′×3′ and an RMS of 15 mJy/beam. The spectral indices of the eastern and western relic were estimated to be −1.44±0.13 and −1.16±0.08 respectively. Although no central halo was detected we were able to put a stringent upper limit on the radio power from any possible radio halo. This limit is a factor of 10 lower than any existing limits. The results and implications of these observations will be presented |