SUNYAEV-ZEL'DOVICH CLUSTER PROFILES MEASURED WITH THE SOUTH POLE TELESCOPE

Journal Article · Sun Jun 20 00:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/716/2/1118· OSTI ID:21452933

Plagge, T; Cho, H -M; George, E M; Holzapfel, W L ^[1]; Benson, B A; Aird, K A; Hrubes, J D ^[2]; Ade, P A. R. ^[3]; Bleem, L E; Carlstrom, J E; Chang, C L; Crawford, T M; Crites, A T; Keisler, R ^[4]; De Haan, T; Dobbs, M A; Holder, G P ^[5]; Hall, N R ^[6]; Halverson, N W ^[7]; Joy, M ^[8]

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1. Department of Physics, University of California, Berkeley, CA 94720 (United States)
2. University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
3. Department of Physics and Astronomy, Cardiff University, CF24 3YB (United Kingdom)
4. Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
5. Department of Physics, McGill University, 3600 Rue University, Montreal, Quebec H3A 2T8 (Canada)
6. Department of Physics, University of California, One Shields Avenue, Davis, CA 95616 (United States)
7. Department of Astrophysical and Planetary Sciences and Department of Physics, University of Colorado, Boulder, CO 80309 (United States)
8. Department of Space Science, VP62, NASA Marshall Space Flight Center, Huntsville, AL 35812 (United States)

We present Sunyaev-Zel'dovich (SZ) measurements of 15 massive X-ray-selected galaxy clusters obtained with the South Pole Telescope (SPT). The SZ cluster signals are measured at 150 GHz, and concurrent 220 GHz data are used to reduce astrophysical contamination. Radial profiles are computed using a technique that takes into account the effects of the beams and filtering. In several clusters, significant SZ decrements are detected out to a substantial fraction of the virial radius. The profiles are fit to the {beta}-model and to a generalized Navarro-Frenk-White (NFW) pressure profile, and are scaled and stacked to probe their average behavior. We find model parameters that are consistent with previous studies: {beta} = 0.86 and r{sub core}/r{sub 500} = 0.20 for the {beta}-model, and ({alpha}{sub n}, {beta}{sub n}, {gamma}{sub n}, c{sub 500}) = (1.0, 5.5, 0.5, 1.0) for the generalized NFW model. Both models fit the SPT data comparably well, and both are consistent with the average SZ profile out to beyond r{sub 500}. The integrated Compton-y parameter Y{sub SZ} is computed for each cluster using both model-dependent and model-independent techniques, and the results are compared to X-ray estimates of cluster parameters. We find that Y{sub SZ} scales with Y{sub X} and gas mass with low scatter. Since these observables have been found to scale with total mass, our results point to a tight mass-observable relation for the SPT cluster survey.

• OSTI ID: 21452933
• Journal Information: Astrophysical Journal, Vol. 716, Issue 2; Other Information: DOI: 10.1088/0004-637X/716/2/1118; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
BACKGROUND RADIATION
COSMOLOGY
GALAXY CLUSTERS
GHZ RANGE 100-1000
MASS
TELESCOPES
X RADIATION
ELECTROMAGNETIC RADIATION
FREQUENCY RANGE
GHZ RANGE
IONIZING RADIATIONS
PHYSICS
RADIATIONS