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ALMA Imaging and Gravitational Lens Models of South Pole Telescope-Selected Dusty, Star-Forming Galaxies at High Redshifts

Authors :
Spilker, Justin
Marrone, Daniel
Aravena, Manuel
Bethermin, Matthieu
Bothwell, Matt
Carlstrom, John
Chapman, Scott
Crawford, Tom
de Breuck, Carlos
Fassnacht, Chris
Gonzalez, Anthony
Greve, Thomas
Hezaveh, Yashar
Litke, Katrina
Ma, Jingzhe
Malkan, Matt
Rotermund, Kaja
Strandet, Maria
Vieira, Joaquin
Weiss, Axel
Welikala, Niraj
Publication Year :
2016

Abstract

The South Pole Telescope has discovered one hundred gravitationally lensed, high-redshift, dusty, star-forming galaxies (DSFGs). We present 0.5" resolution 870um Atacama Large Millimeter/submillimeter Array imaging of a sample of 47 DSFGs spanning z=1.9-5.7, and construct gravitational lens models of these sources. Our visibility-based lens modeling incorporates several sources of residual interferometric calibration uncertainty, allowing us to properly account for noise in the observations. At least 70% of the sources are strongly lensed by foreground galaxies (mu_870um > 2), with a median magnification mu_870um = 6.3, extending to mu_870um > 30. We compare the intrinsic size distribution of the strongly lensed sources to a similar number of unlensed DSFGs and find no significant differences in spite of a bias between the magnification and intrinsic source size. This may indicate that the true size distribution of DSFGs is relatively narrow. We use the source sizes to constrain the wavelength at which the dust optical depth is unity and find this wavelength to be correlated with the dust temperature. This correlation leads to discrepancies in dust mass estimates of a factor of 2 compared to estimates using a single value for this wavelength. We investigate the relationship between the [CII] line and the far-infrared luminosity and find that the same correlation between the [CII]L_FIR ratio and Sigma_FIR found for low-redshift star-forming galaxies applies to high-redshift galaxies and extends at least two orders of magnitude higher in Sigma_FIR. This lends further credence to the claim that the compactness of the IR-emitting region is the controlling parameter in establishing the "[CII] deficit."<br />Comment: Resubmitted to ApJ following revision. Tables of properties derived from the lens models are available at http://justinspilker.com/lensmodels

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1604.05723
Document Type :
Working Paper
Full Text :
https://doi.org/10.3847/0004-637X/826/2/112