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Title: THE ATACAMA COSMOLOGY TELESCOPE: EXTRAGALACTIC SOURCES AT 148 GHz IN THE 2008 SURVEY

Abstract

We report on extragalactic sources detected in a 455 deg{sup 2} map of the southern sky made with data at a frequency of 148 GHz from the Atacama Cosmology Telescope (ACT) 2008 observing season. We provide a catalog of 157 sources with flux densities spanning two orders of magnitude: from 15 mJy to 1500 mJy. Comparison to other catalogs shows that 98% of the ACT detections correspond to sources detected at lower radio frequencies. Three of the sources appear to be associated with the brightest cluster galaxies of low-redshift X-ray-selected galaxy clusters. Estimates of the radio to millimeter-wave spectral indices and differential counts of the sources further bolster the hypothesis that they are nearly all radio sources, and that their emission is not dominated by re-emission from warm dust. In a bright (>50 mJy) 148 GHz selected sample with complete cross-identifications from the Australia Telescope 20 GHz survey, we observe an average steepening of the spectra between 5, 20, and 148 GHz with median spectral indices of {alpha}{sub 5-20} = -0.07 {+-} 0.06, {alpha}{sub 20-148} = -0.39 {+-} 0.04, and {alpha}{sub 5-148} = -0.20 {+-} 0.03. When the measured spectral indices are taken into account, the 148 GHz differential sourcemore » counts are consistent with previous measurements at 30 GHz in the context of a source count model dominated by radio sources. Extrapolating with an appropriately rescaled model for the radio source counts, the Poisson contribution to the spatial power spectrum from synchrotron-dominated sources with flux density less than 20 mJy is C {sup Sync} = (2.8 {+-} 0.3) x 10{sup -6}{mu}K{sup 2}.« less

Authors:
; ;  [1]; ; ;  [2]; ; ;  [3]; ;  [4];  [5];  [6]; ; ;  [7];  [8];  [9];  [10];  [11]
+ Show Author Affiliations
  1. Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, NJ 08544 (United States)
  2. Departamento de AstronomIa y Astrofisica, Facultad de Fisica, Pontificia Universidad Catolica de Chile, Casilla 306, Santiago 22 (Chile)
  3. Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104 (United States)
  4. Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, ON M5S 3H8 (Canada)
  5. Department of Physics and Astronomy, Haverford College, Haverford, PA 19041 (United States)
  6. School of Physics and Astronomy, Cardiff University, The Parade, Cardiff, Wales CF24 3AA (United Kingdom)
  7. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z4 (Canada)
  8. Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544 (United States)
  9. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260 (United States)
  10. Code 553/665, NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  11. NIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO 80305 (United States)
Publication Date:
OSTI Identifier:
21574708
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 731; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/731/2/100; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BACKGROUND RADIATION; COSMIC RADIO SOURCES; FLUX DENSITY; GALAXIES; GALAXY CLUSTERS; RADIOWAVE RADIATION; ELECTROMAGNETIC RADIATION; RADIATIONS

Citation Formats

Marriage, Tobias A, Yenting, Lin, Das, Sudeep, Juin, Jean Baptiste, Aguirre, Paula, Barrientos, L Felipe, Marsden, Danica, Devlin, Mark J, Dicker, Simon R, Nolta, Michael R, Bond, John R, Partridge, Bruce, Ade, Peter A. R., Amiri, Mandana, Battistelli, Elia S, Burger, Bryce, Appel, John William, Brown, Ben, Chervenak, Jay, and Doriese, W Bertrand. THE ATACAMA COSMOLOGY TELESCOPE: EXTRAGALACTIC SOURCES AT 148 GHz IN THE 2008 SURVEY. United States: N. p., 2011. Web. doi:10.1088/0004-637X/731/2/100.
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Marriage, Tobias A, Yenting, Lin, Das, Sudeep, Juin, Jean Baptiste, Aguirre, Paula, Barrientos, L Felipe, Marsden, Danica, Devlin, Mark J, Dicker, Simon R, Nolta, Michael R, Bond, John R, Partridge, Bruce, Ade, Peter A. R., Amiri, Mandana, Battistelli, Elia S, Burger, Bryce, Appel, John William, Brown, Ben, Chervenak, Jay, & Doriese, W Bertrand. THE ATACAMA COSMOLOGY TELESCOPE: EXTRAGALACTIC SOURCES AT 148 GHz IN THE 2008 SURVEY. United States. https://doi.org/10.1088/0004-637X/731/2/100
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Marriage, Tobias A, Yenting, Lin, Das, Sudeep, Juin, Jean Baptiste, Aguirre, Paula, Barrientos, L Felipe, Marsden, Danica, Devlin, Mark J, Dicker, Simon R, Nolta, Michael R, Bond, John R, Partridge, Bruce, Ade, Peter A. R., Amiri, Mandana, Battistelli, Elia S, Burger, Bryce, Appel, John William, Brown, Ben, Chervenak, Jay, and Doriese, W Bertrand. 2011. "THE ATACAMA COSMOLOGY TELESCOPE: EXTRAGALACTIC SOURCES AT 148 GHz IN THE 2008 SURVEY". United States. https://doi.org/10.1088/0004-637X/731/2/100.
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@article{osti_21574708,
title = {THE ATACAMA COSMOLOGY TELESCOPE: EXTRAGALACTIC SOURCES AT 148 GHz IN THE 2008 SURVEY},
author = {Marriage, Tobias A and Yenting, Lin and Das, Sudeep and Juin, Jean Baptiste and Aguirre, Paula and Barrientos, L Felipe and Marsden, Danica and Devlin, Mark J and Dicker, Simon R and Nolta, Michael R and Bond, John R and Partridge, Bruce and Ade, Peter A. R. and Amiri, Mandana and Battistelli, Elia S and Burger, Bryce and Appel, John William and Brown, Ben and Chervenak, Jay and Doriese, W Bertrand},
abstractNote = {We report on extragalactic sources detected in a 455 deg{sup 2} map of the southern sky made with data at a frequency of 148 GHz from the Atacama Cosmology Telescope (ACT) 2008 observing season. We provide a catalog of 157 sources with flux densities spanning two orders of magnitude: from 15 mJy to 1500 mJy. Comparison to other catalogs shows that 98% of the ACT detections correspond to sources detected at lower radio frequencies. Three of the sources appear to be associated with the brightest cluster galaxies of low-redshift X-ray-selected galaxy clusters. Estimates of the radio to millimeter-wave spectral indices and differential counts of the sources further bolster the hypothesis that they are nearly all radio sources, and that their emission is not dominated by re-emission from warm dust. In a bright (>50 mJy) 148 GHz selected sample with complete cross-identifications from the Australia Telescope 20 GHz survey, we observe an average steepening of the spectra between 5, 20, and 148 GHz with median spectral indices of {alpha}{sub 5-20} = -0.07 {+-} 0.06, {alpha}{sub 20-148} = -0.39 {+-} 0.04, and {alpha}{sub 5-148} = -0.20 {+-} 0.03. When the measured spectral indices are taken into account, the 148 GHz differential source counts are consistent with previous measurements at 30 GHz in the context of a source count model dominated by radio sources. Extrapolating with an appropriately rescaled model for the radio source counts, the Poisson contribution to the spatial power spectrum from synchrotron-dominated sources with flux density less than 20 mJy is C {sup Sync} = (2.8 {+-} 0.3) x 10{sup -6}{mu}K{sup 2}.},
doi = {10.1088/0004-637X/731/2/100},
url = {https://www.osti.gov/biblio/21574708}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 731,
place = {United States},
year = {Wed Apr 20 00:00:00 EDT 2011},
month = {Wed Apr 20 00:00:00 EDT 2011}
}
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Journal Article:
https://doi.org/10.1088/0004-637X/731/2/100
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