A Deep Chandra X-ray Observation of El Gordo

Type Conference Paper
Names John P. Hughes, A. J. Baker, F. Barrientos, M. J. Jee, L. Infante, R. Lindner, R. Mandelbaum, F. Menanteau, C. Sifon, A. Zitrin
Conference Name American Astronomical Society Meeting Abstracts #223
Volume 223
Date January 1, 2014
URL http://adsabs.org/2014AAS.22310607H
Library Catalog adslabs.org
Abstract We present new results on ACT-CL J0102-4915 ("El Gordo") based on a deep Chandra observation. We present a temperature map on sub-arcminute scales that shows significant variations from a low of 5 keV near the location of the brightest cluster galaxy (BCG) to a high of 25 keV. The cold core shows evidence for a cold front, an interface across which the temperature decreases while the density rises, providing further evidence for a major merger in El Gordo. We also examine the locations of merger shocks as traced by radio relics to search for density and temperature jumps in the hot cluster gas. The BCG, which is significantly bluer than expected from a passively evolving elliptical galaxy, is offset by some 5-10 arcseconds from the peak X-ray surface brightness. We relate the density and temperature structures visible in the Chandra data with our recent results from gravitational lensing analyses of El Gordo. This work is supported by Chandra grant GO2-13156X and Hubble grant HST-GO-12755.01-A.
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