Computer Science
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atnf.prop.3198m&link_type=abstract
ATNF proposal C2037, Semester: April, 2010
Computer Science
Cosmology, Atca
Scientific paper
We have used ATCA-CABB to detect high-resolution Sunyaev-Zeldovich Effect (SZE) features over the entire Chandra X-ray emission regions in the 'bullet' cluster. A deep compact SZE hole was detected offset from the main hot cluster centre, and at a weaker level the SZE ridge appears to follow the bow shock of the bullet. This represents a novel insight into cluster merger dynamics. Here we intend to consolidate this remarkable discovery with high sensitivity that will allow quantitative modeling. In particular, we aim to make images of temperature and electron density, and observe 1. The SZE, for pressure distribution. 2. The 20 to 0.7 cm spectrum and polarization of the central radio halo in the westward cluster, for probing merger history and test models of radio halo formation. 3. Polarization properties through QU images and Faraday rotation through the radio halo region, for constraining magnetic field in the ICM. Equal-strength radio halo and SZE exist in overlapping regions of the cluster. High-sensitivity multi-frequency observations are needed to separate the effects, thereby enabling detailed analyses of the structure and dynamics of this cluster using data from ATCA, APEX and ESO/MPG.
Malu Siddharth
Narasimha D.
Subrahmanyan Ravi
Wieringa Mark
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