Millimeter-wave Point Sources from the 2500 Square Degree SPT-SZ Survey: Catalog and Population Statistics

• Published in: The Astrophysical Journal
• Main Authors: Everett, W. B., Zhang, L., Crawford, T. M., Vieira, J. D., Aravena, M., Archipley, M. A., Austermann, J. E., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Chang, C. L., Chapman, S., Crites, A. T., de Haan, T., Dobbs, M. A., George, E. M., Halverson, N. W., Harrington, N., Holder, G. P., Holzapfel, W. L., Hrubes, J. D., Knox, L., Lee, A. T., Luong-Van, D., Mangian, A. C., Marrone, D. P., McMahon, J. J., Meyer, S. S., Mocanu, L. M., Mohr, J. J., Natoli, T., Padin, S., Pryke, C., Reichardt, C. L., Reuter, C. A., Ruhl, J. E., Sayre, J. T., Schaffer, K. K., Shirokoff, E., Spilker, J. S., Stalder, B., Staniszewski, Z., Stark, A. A., Story, K. T., Switzer, E. R., Vanderlinde, K., Weiß, A., Williamson, R.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: American Astronomical Society 2020
• Subjects: High-redshift galaxies; Submillimeter astronomy; Surveys; South pole
• Online Access: https://doi.org/10.3847/1538-4357/ab9df7

We present a catalog of emissive point sources detected in the SPT-SZ survey, a contiguous 2530 square degree area surveyed with the South Pole Telescope (SPT) from 2008–2011 in three bands centered at 95, 150, and 220 GHz. The catalog contains 4845 sources measured at a significance of 4.5σ or greater in at least one band, corresponding to detections above approximately 9.8, 5.8, and 20.4 mJy in 95, 150, and 220 GHz, respectively. The spectral behavior in the SPT bands is used for source classification into two populations based on the underlying physical mechanisms of compact, emissive sources that are bright at millimeter wavelengths: synchrotron radiation from active galactic nuclei and thermal emission from dust. The latter population includes a component of high-redshift sources often referred to as submillimeter galaxies (SMGs). In the relatively bright flux ranges probed by the survey, these sources are expected to be magnified by strong gravitational lensing. The survey also contains sources consistent with protoclusters, groups of dusty galaxies at high redshift undergoing collapse. We cross-match the SPT-SZ catalog with external catalogs at radio, infrared, and X-ray wavelengths and identify available redshift information. The catalog splits into 3980 synchrotron-dominated and 865 dust-dominated sources, and we determine a list of 506 SMGs. Ten sources in the catalog are identified as stars. We calculate number counts for the full catalog, and synchrotron and dusty components, using a bootstrap method and compare our measured counts with models. This paper represents the third and final catalog of point sources in the SPT-SZ survey. © 2020 The American Astronomical Society. Received 2020 March 5; revised 2020 June 5; accepted 2020 June 16; published 2020 August 31. The SPT is supported by the NSF through grant PLR-1248097, with partial support through PHY-1125897, the Kavli Foundation and the Gordon and Betty Moore Foundation grant GBMF 947. D.P.M. and J.D.V. acknowledge support from the US NSF ...