A Deep Chandra X-ray Observation of El Gordo

John P Hughes, AJ Baker, F Barrientos, MJ Jee, L Infante, R Lindner, R Mandelbaum, F Menanteau, C Sifon, A Zitrin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.
Original languageEnglish GB
Title of host publicationAmerican Astronomical Society Meeting Abstracts 223
Pages106-07
Volume223
StatePublished - 2014

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