A Deep Chandra X-ray Observation of El Gordo Conference Paper uri icon


  • 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 …

publication date

  • January 1, 2014