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The Atacama Cosmology Telescope: Dusty Star-Forming Galaxies and Active Galactic Nuclei in the Southern SurveyWe present a catalogue of 191 extragalactic sources detected by the Atacama Cosmology Telescope (ACT) at 148 and/or 218 GHz in the 2008 Southern survey. Flux densities span 14 - 1700 mJy, and we use source spectral indices derived using ACT-only data to divide our sources into two subpopulations: 167 radio galaxies powered by central active galactic nuclei (AGN) and 24 dusty star-forming galaxies (DSFGs). We cross-identify 97 per cent of our sources (166 of the AGN and 19 of the DSFGs) with those in currently available catalogues. When combined with flux densities from the Australia Telescope 20 GHz survey and follow-up observations with the Australia Telescope Compact Array, the synchrotron-dominated population is seen to exhibit a steepening of the slope of the spectral energy distribution from 20 to 148 GHz, with the trend continuing to 218 GHz. The ACT dust-dominated source population has a median spectral index, alpha(sub 148−218), of 3.7 +0.62/-0.86), and includes both local galaxies and sources with redshift around 6. Dusty sources with no counterpart in existing catalogues likely belong to a recently discovered subpopulation of DSFGs lensed by foreground galaxies or galaxy groups.
Document ID
20140013288
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
External Source(s)
doi:10.1093/mnras/stu001
Authors
Marsden, Danica (California Univ. Santa Barbara, CA, United States)
Gralla, Megan (Johns Hopkins Univ. Baltimore, MD, United States)
Marriage, Tobias A. (Johns Hopkins Univ. Baltimore, MD, United States)
Switzer, Eric R. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Partridge, Bruce (Haverford Coll. PA, United States)
Massardi, Marcella (Osservatorio Astronomico Padova, Italy)
Morales, Gustavo (Pontificia Univ. Catolica de Chile Santiago, Chile)
Addison, Graeme (British Columbia Univ. Vancouver, British Columbia, Canada)
Bond, J. Richard (Toronto Univ. Ontario, Canada)
Crichton, Devin (Johns Hopkins Univ. Baltimore, MD, United States)
Das, Sudeep (California Univ. Berkeley, CA, United States)
Devlin, Mark (Pennsylvania Univ. Philadelphia, PA, United States)
Dunner, Rolando (Pontificia Univ. Catolica de Chile Santiago, Chile)
Hajian, Amir (Toronto Univ. Ontario, Canada)
Hilton, Matt (KwaZulu-Natal Univ. Durban, South Africa)
Hincks, Adam (Toronto Univ. Ontario, Canada)
Hughes, John P. (Rutgers - The State Univ. Piscataway, NJ, United States)
Irwin, Kent (National Inst. of Standards and Technology Boulder, CO, United States)
Kosowsky, Arthur (Pittsburgh Univ. Pittsburgh, PA, United States)
Menanteau, Felipe (Rutgers - The State Univ. Piscataway, NJ, United States)
Moodley, Kavilan (KwaZulu-Natal Univ. Durban, South Africa)
Niemack, Michael (Cornell Univ. Ithaca, NY, United States)
Page, Lyman (Princeton Univ. Princeton, NJ, United States)
Reese, Erik D. (Pennsylvania Univ. Philadelphia, PA, United States)
Wollack, Edward (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
November 3, 2014
Publication Date
February 7, 2014
Publication Information
Publisher: Monthly Notices of the Royal Astrnonmical Society
Subject Category
Astronomy
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN15194
Funding Number(s)
CONTRACT_GRANT: NSF PHY-1214379
CONTRACT_GRANT: NSF PIRE-0507768
CONTRACT_GRANT: NSF AST-0408698
CONTRACT_GRANT: NSF PHY-0855887
CONTRACT_GRANT: NSF PHY-0355328
CONTRACT_GRANT: NSF AST-0965625
CONTRACT_GRANT: NSF AST-0707731
CONTRACT_GRANT: NSF PHY-0114422
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Telescope
Cosmology
Atacama

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