2011/01/31 by Nick Hand, John William Appel, John W. Appel +45 · 4 citations
Physics and Astronomy · #Cluster (spacecraft) #Cosmology #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Halo #Luminosity #Sky #Solar and Space Plasma Dynamics #South Pole Telescope #Telescope #astro-ph.CO
paper · pdf · doi:10.1088/0004-637x/736/1/39
published as The Astrophysical Journal, Volume 736, Issue 1, article id. 39 (2011) · Accepted in ApJ. 14 pages, 6 figures
openalex publication_date 2011/07/05 · arxiv created 2012/01/19 · arxiv updated 2012/01/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We 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. The LRG sample is divided by luminosity into four bins, and estimates for the central 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 Y 200 and clustering properties to relate the galaxy luminosity to halo mass. We also use a relation between brightest cluster galaxy luminosity and cluster mass based on stacked gravitational lensing measurements to estimate the characteristic halo masses. The masses are found to be around 10 14 M ☉ .