@article{62405d53c078491ab4488e5f3f9e8b54,
title = "On the redshift distribution and physical properties of ACT-selected DSFGs",
abstract = "We present multi-wavelength detections of nine candidate gravitationally lensed dusty starforming galaxies (DSFGs) selected at 218 GHz (1.4 mm) from the Atacama Cosmology Telescope (ACT) equatorial survey. Among the brightest ACT sources, these represent the subset of the total ACT sample lying in Herschel SPIRE fields, and all nine of the 218 GHz detections were found to have bright Herschel counterparts. By fitting their spectral energy distributions (SEDs) with a modified blackbody model with power-law temperature distribution, we find the sample has a median redshift of z = 4.1+1.1 -1.0 (68 per cent confidence interval), as expected for 218 GHz selection, and an apparent total infrared luminosity of log10(μLIR/L⊙) = 13.86+0.33 -0.30, which suggests that they are either strongly lensed sources or unresolved collections of unlensed DSFGs. The effective apparent diameter of the sample is √μd = 4.2+1.7-1.0 kpc, further evidence of strong lensing or multiplicity, since the typical diameter of DSFGs is 1.0-2.5 kpc. We emphasize that the effective apparent diameter derives from SED modelling without the assumption of optically thin dust (as opposed to image morphology). We find that the sources have substantial optical depth (τ = 4.2+3.7 -1.9) to dust around the peak in the modified blackbody spectrum (λobs = 500 μm), a result that is robust to model choice.",
keywords = "Galaxies: evolution, Galaxies: high-redshift, Galaxies: star formation, Galaxies: starburst, Submillimetre: galaxies",
author = "T. Su and Marriage, {T. A.} and V. Asboth and Baker, {A. J.} and Bond, {J. R.} and D. Crichton and Devlin, {M. J.} and R. D{\"u}nner and D. Farrah and Frayer, {D. T.} and Gralla, {M. B.} and K. Hall and M. Halpern and Harris, {A. I.} and M. Hilton and Hincks, {A. D.} and Hughes, {J. P.} and Niemack, {M. D.} and Page, {L. A.} and B. Partridge and J. Rivera and D. Scott and Sievers, {J. L.} and Thornton, {R. J.} and Viero, {M. P.} and L. Wang and Wollack, {E. J.} and M. Zemcov",
note = "Funding Information: We thank our LMT collaborators for permission to make use of the spectroscopic redshift for ACT-S J0107+0001 in advance of publication.We thank Zhen-Yi Cai for providing model source distributions. AJB acknowledges support from the National Science Foundation though grant AST-0955810. ACT was supported by the U.S. National Science Foundation through awards AST-0408698 and AST-0965625 for the ACT project, as well as awards PHY-0855887 and PHY-1214379. ACT funding was also provided by Princeton University, the University of Pennsylvania, and a Canada Foundation for Innovation (CFI) award toUBC.ACT operates in the Parque Astron{\'o}mico Atacama in northern Chile under the auspices of the Comisi{\'o}n Nacional de Investigaci{\'o}n Cient{\'i}fica y Tecnol{\'o}gica de Chile (CONICYT). Computations were performed on the GPC supercomputer at the SciNet HPC Consortium. SciNet is funded by the CFI under the auspices of Compute Canada, the Government of Ontario, the Ontario Research Fund-Research Excellence; and the University of Toronto. Support for CARMA construction was derived from the Moore and Norris Foundations, the Associates of Caltech, the states of California, Illinois, and Maryland, and the NSF. CARMA development and operations were supported by the NSF under a cooperative agreement, and by the CARMA partner universities. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. We have used optical imaging from SDSS. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, theMax Planck Society, and theHigher Education Funding Council for England. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. Part of our NIR imaging is based on observations obtained as part of the VHS, ESO Progam, 179.A-2010 (PI: McMahon). We also have used data based on observations obtainedwith theApache Point Observatory 3.5-metre telescope, which is owned and operated by the Astrophysical Research Consortium. This publication makes use of data products from the WISE, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Some of the observations reported in this paper were obtained with the Southern African Large Telescope (SALT). Finally, we acknowledge the MNRAS reviewer and editor for comments that improved the paper Publisher Copyright: {\textcopyright} 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.",
year = "2017",
month = jan,
day = "1",
doi = "10.1093/mnras/stw2334",
language = "English (US)",
volume = "464",
pages = "968--984",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",
}