Implications of a High Angular Resolution Image of the Sunyaev-Zel'Dovich Effect in RXJ1347-1145
Ade, P.; Aguirre, J. E.; Devlin, M. J.; Cotton, W. D.; Staguhn, J. G.; Moseley, H.; Molnar, S. M.; Koch, P. M.; Irwin, K. D.; Dicker, S. R.; Mason, B. S.; Korngut, P. M.; Sievers, J.; Benford, D.
United States, Taiwan, Canada, United Kingdom
Abstract
The most X-ray luminous cluster known, RXJ1347-1145 (z = 0.45), has been the object of extensive study across the electromagnetic spectrum. We have imaged the Sunyaev-Zel'dovich effect (SZE) at 90 GHz (λ = 3.3 mm) in RXJ1347-1145 at 10'' resolution with the 64 pixel MUSTANG bolometer array on the Green Bank Telescope, confirming a previously reported strong, localized enhancement of the SZE 20'' to the southeast of the center of X-ray emission. This enhancement of the SZE has been interpreted as shock-heated (>20 keV) gas caused by an ongoing major (low mass ratio) merger event. Our data support this interpretation. We also detect a pronounced asymmetry in the projected cluster pressure profile, with the pressure just east of the cluster core ~1.6× higher than just to the west. This is the highest resolution image of the SZE made to date.