The atacama cosmology telescope: Dusty star-forming galaxies and active galactic nuclei in the southern survey

Danica Marsden, Megan Gralla, Tobias A. Marriage, Eric R. Switzer, Bruce Partridge, Marcella Massardi, Gustavo Morales, Graeme Addison, J. Richard Bond, Devin Crichton, Sudeep Das, Mark Devlin, Rolando Dünner, Amir Hajian, Matt Hilton, Adam Hincks, John P. Hughes, Kent Irwin, Arthur Kosowsky, Felipe MenanteauKavilan Moodley, Michael Niemack, Lyman Page, Erik D. Reese, Schmitt Benjamin Schmitt, Neelima Sehgal, Jonathan Sievers, Suzanne Staggs, Daniel Swetz, Robert Thornton, Edward Wollack

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

We 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 usingACT-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 theAGNand 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, a148-218, 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.

Original languageEnglish (US)
Pages (from-to)1556-1574
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume439
Issue number2
DOIs
StatePublished - Apr 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Active-galaxies
  • High-redshift
  • Methods
  • Numerical-surveys-galaxies

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    Marsden, D., Gralla, M., Marriage, T. A., Switzer, E. R., Partridge, B., Massardi, M., Morales, G., Addison, G., Bond, J. R., Crichton, D., Das, S., Devlin, M., Dünner, R., Hajian, A., Hilton, M., Hincks, A., Hughes, J. P., Irwin, K., Kosowsky, A., ... Wollack, E. (2014). The atacama cosmology telescope: Dusty star-forming galaxies and active galactic nuclei in the southern survey. Monthly Notices of the Royal Astronomical Society, 439(2), 1556-1574. https://doi.org/10.1093/mnras/stu001