The Atacama Cosmology Telescope: An SZ Cluster Stacking Analysis Using Multifrequency Data

Details The Atacama Cosmology Telescope: An SZ Cluster Stacking Analysis Using Multifrequency Data The Atacama Cosmology Telescope: An SZ Cluster Stacking Analysis Using Multifrequency Data

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21540705f&link_type=abstract

American Astronomical Society, AAS Meeting #215, #407.05; Bulletin of the American Astronomical Society, Vol. 42, p.232

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Atacama Cosmology Telescope (ACT) has mapped one thousand square degrees of millimeter-wave sky at arc minute resolution. The resulting data is ideal for detecting the Sunyaev-Zel'dovich (SZ) effect in galaxy clusters and benefits from significant overlap with multifrequency data sets (e.g., SDSS stripe 82 and BCS 5h and 23h fields). By using auxiliary information from optical and X-ray observations to characterize cluster redshift and physical state, homogeneous samples of ACT SZ clusters can be stacked to obtain high signal to noise SZ profiles as a function of, e.g., richness. The SZ flux traces electron gas pressure in the cluster which, given a physical model, can be related to X-ray and optical observables. We use the stacked SZ profiles to test the validity of such models and to better understand the relationship of the SZ and other observables to the underlying dark matter halo profile. Establishing the dark matter-observable relationship in clusters is essential both for understanding cluster astrophysics and for characterizing the cosmology-dependent evolution of the number density of massive clusters.

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