paper

The Atacama Cosmology Telescope: The Two-Season ACTPol Sunyaev-Zel'dovich Effect Selected Cluster Catalog

arXiv:1709.05600 · doi:10.3847/1538-4365/aaa6cb

Abstract

We present a catalog of 182 galaxy clusters detected through the Sunyaev-Zel'dovich effect by the Atacama Cosmology Telescope in a contiguous 987.5 deg field. The clusters were detected as SZ decrements by applying a matched filter to 148 GHz maps that combine the original ACT equatorial survey with data from the first two observing seasons using the ACTPol receiver. Optical/IR confirmation and redshift measurements come from a combination of large public surveys and our own follow-up observations. Where necessary, we measured photometric redshifts for clusters using a pipeline that achieves accuracy when tested on SDSS data. Under the assumption that clusters can be described by the so-called Universal Pressure Profile and its associated mass-scaling law, the full signal-to-noise > 4 sample spans the mass range , with median M. The sample covers the redshift range (median ) and 28 clusters are new discoveries (median ). We compare our catalog with other overlapping cluster samples selected using the SZ, optical,and X-ray wavelengths. We find the ratio of the UPP-based SZ mass to richness-based weak-lensing mass is . After applying this calibration, the mass distribution for clusters with M is consistent with the number of such clusters found in the South Pole Telescope SZ survey.

arXiv commentAccepted for publication in ApJS; 38 pages, 31 figures; a .fits table that combines tables A1-A3 is available from https://acru.ukzn.ac.za/~mjh/ACTPol_E-D56Catalog (and will be posted on LAMBDA soon)

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