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29 March 2024
 
  » arxiv » 1101.1951

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The Atacama Cosmology Telescope: Detection of Sunyaev-Zel'dovich Decrement in Groups and Clusters Associated with Luminous Red Galaxies
Nick Hand ; John William Appel ; Nick Battaglia ; J Richard Bond ; Sudeep Das ; Mark J. Devlin ; Joanna Dunkley ; Rolando Dunner ; Thomas Essinger-Hileman ; Joseph W. Fowler ; Amir Hajian ; Mark Halpern ; Matthew Hasselfield ; Matt Hilton ; Adam D. Hincks ; Renee Hlozek ; John P. Hughes ; Kent D. Irwin ; Jeff Klein ; Arthur Kosowsky ; Yen-Ting Lin ; Tobias A. Marriage ; Danica Marsden ; Mike McLaren ; Felipe Menanteau ; Kavilan Moodley ; Michael D. Niemack ; Michael R. Nolta ; Lyman A. Page ; Lucas Parker ; Bruce Partridge ; Reed Plimpton ; Erik D. Reese ; Felipe Rojas ; Neelima Sehgal ; Blake D. Sherwin ; Jonathan L. Sievers ; David N. Spergel ; Suzanne T. Staggs ; Daniel S. Swetz ; Eric R. Switzer ; Robert Thornton ; Hy Trac ; Katerina Visnjic ; Ed Wollack ;
Date 10 Jan 2011
AbstractWe present a detection of the Sunyaev-Zel’dovich (SZ) decrement associated with the Luminous Red Galaxy (LRG) sample of the Sloan Digital Sky Survey. The SZ data come from 148 GHz maps of the equatorial region made by the Atacama Cosmology Telescope (ACT). The LRG sample is divided by luminosity into four bins, and estimates for the central Sunyaev-Zel’dovich (SZ) temperature decrement are calculated through a stacking process. We detect and account for a bias of the SZ signal due to weak radio sources. We use numerical simulations to relate the observed decrement to Y200 and clustering properties to relate the galaxy luminosity bins to mass. We also use a relation between BCG luminosity and cluster mass based on stacked gravitational lensing measurements to estimate the characteristic halo masses. The masses are found to be in the range 1e13 - 1e14 M_sun, a lower range than has been previously probed.
Source arXiv, 1101.1951
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