Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933814h&link_type=abstract
American Astronomical Society, AAS Meeting #219, #338.14
Other
Scientific paper
ACT-CL J0102? is a massive galaxy cluster that was recently discovered by the Atacama Cosmology Telescope (ACT) based on the strength of its Sunyaev-Zeldovich effect signal. Follow-up observations with VLT/FORS2 and Chandra have provided precise values for the redshift (z=0.870), velocity dispersion (sigma = 1321±106 km/s), and integrated gas temperature (TX = 14.5±0.1 keV). From several empirical scaling relations we estimate a total mass of M200= (2.16±0.32)× 1015 M&sun;, greater than all other known clusters at z>0.6, hence we dub ACT-CL J0102? "El Gordo" (meaning The Big or Fat One in Spanish). Several lines of evidence from the optical and X-ray data strongly indicate that El Gordo is undergoing a major merger between components with a mass ratio of approximately 2 to 1. The cluster's X-ray morphology is complex with significant temperature variations from a low of 6.6±0.7 keV at the offset peak (the merging low-entropy, high-metallicity, cool core) to a high of 22±6 keV in an annulus approximately 1' from the centroid of the cluster. There is radio emission from the Sydney University Molonglo Sky Survey (SUMSS) at 843 MHz associated with the leading edge of the merging cool core as well as on the opposite edge of the cluster suggesting the possible presence of intense giant radio relics in El Gordo.
We gratefully acknowledge support from the NSF (PIRE-0507768 award number OISE-0530095) and NASA (Chandra grant number GO1-12008X).
ACT Collaboration
Hughes John Patrick
Menanteau Felipe
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