Correlations in the (SUB)millimeter background from act × blast

Amir Hajian, Marco P. Viero, Graeme Addison, Paula Aguirre, John William Appel, Nick Battaglia, James J. Bock, J. Richard Bond, Sudeep Das, Mark J. Devlin, Simon R. Dicker, Joanna Dunkley, Rolando Dünner, Thomas Essinger-Hileman, John P. Hughes, Joseph W. Fowler, Mark Halpern, Matthew Hasselfield, Matt Hilton, Adam D. HincksRenée Hlozek, Kent D. Irwin, Jeff Klein, Arthur Kosowsky, Yen Ting Lin, Tobias A. Marriage, Danica Marsden, Gaelen Marsden, Felipe Menanteau, Lorenzo Moncelsi, Kavilan Moodley, Calvin B. Netterfield, Michael D. Niemack, Michael R. Nolta, Lyman A. Page, Lucas Parker, Guillaume Patanchon, Douglas Scott, Neelima Sehgal, Jon Sievers, David N. Spergel, Suzanne T. Staggs, Daniel S. Swetz, Eric R. Switzer, Robert Thornton, Ed Wollack

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26 Scopus citations


We present measurements of the auto- and cross-frequency correlation power spectra of the cosmic (sub)millimeter background at 250, 350, and 500 μm (1200, 860, and 600GHz) from observations made with the Balloon-borne Large Aperture Submillimeter Telescope (BLAST); and at 1380 and 2030 μm (218 and 148GHz) from observations made with the Atacama Cosmology Telescope (ACT). The overlapping observations cover 8.6 deg2 in an area relatively free of Galactic dust near the south ecliptic pole. The ACT bands are sensitive to radiation from the cosmic microwave background, to the Sunyaev-Zel'dovich effect from galaxy clusters, and to emission by radio and dusty star-forming galaxies (DSFGs), while the dominant contribution to the BLAST bands is from DSFGs. We confirm and extend the BLAST analysis of clustering with an independent pipeline and also detect correlations between the ACT and BLAST maps at over 25σ significance, which we interpret as a detection of the DSFGs in the ACT maps. In addition to a Poisson component in the cross-frequency power spectra, we detect a clustered signal at 4σ, and using a model for the DSFG evolution and number counts, we successfully fit all of our spectra with a linear clustering model and a bias that depends only on redshift and not on scale. Finally, the data are compared to, and generally agree with, phenomenological models for the DSFG population. This study demonstrates the constraining power of the cross-frequency correlation technique to constrain models for the DSFGs. Similar analyses with more data will impose tight constraints on future models.

Original languageEnglish (US)
Article number40
JournalAstrophysical Journal
Issue number1
StatePublished - Jan 1 2012

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • cosmic background radiation
  • cosmology: observations
  • galaxies: evolution
  • infrared: galaxies
  • large-scale structure of universe
  • submillimeter: galaxies


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