Kiloparsec-Scale Dust Disks in High-Redshift Luminous Submillimeter Galaxies

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Kiloparsec-Scale Dust Disks in High-Redshift Luminous Submillimeter Galaxies

Hodge, J. A. (author): Universiteit Leiden (UL),Leiden University (UL)

Swinbank, A. M. (author): Durham University

Simpson, J. M. (author): University of Edinburgh

Smail, I. (author): Durham University

Walter, F. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

Alexander, D. M. (author): Durham University

Bertoldi, F. (author): Universität Bonn,University of Bonn

Biggs, A. D. (author): European Southern Observatory (ESO)

Brandt, W. N. (author): Pennsylvania State University

Chapman, S. C. (author): Dalhousie University

Chen, C. C. (author): Durham University

Coppin, K. E. K. (author): McGill University

Cox, P. (author): Atacama Large Millimeter-submillimeter Array (ALMA)

Dannerbauer, H. (author): Universität Wien,University of Vienna,Instituto de Astrofísica de Canarias

Edge, A. C. (author): Durham University

Greve, T. R. (author): University College London (UCL)

Ivison, R. J. (author): University of Edinburgh,Royal Observatory

Karim, A. (author): Universität Bonn,University of Bonn

Knudsen, Kirsten Kraiberg, 1976 (author): Chalmers tekniska högskola,Chalmers University of Technology

Menten, K. M. (author): Universität Bonn,University of Bonn

Rix, H. W. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

Schinnerer, E. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

Wardlow, J. L. (author): Durham University

Weiss, A. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

van der Werf, P. (author): Universiteit Leiden (UL),Leiden University (UL)

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2016-12-09
2016
English.
In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 833:1

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Journal article (peer-reviewed)

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We present high-resolution (0 ''.6) 870 mu m Atacama Large Millimeter/submillimeter Array (ALMA) imaging of 16 luminous (LIR similar to 4 x 10(12) L-circle dot) submillimeter galaxies (SMGs) from the ALESS survey of the Extended Chandra Deep Field South. This dust imaging traces the dust-obscured star formation in these z similar to 2.5 galaxies on similar to 1.3 kpc scales. The emission has a median effective radius of R-e = 0 ''.24 +/- 0 ''.02, corresponding to a typical physical size of R-e= 1.8 +/- 0.2 kpc. We derive a median Sersic index of n = 0.9 +/- 0.2, implying that the dust emission is remarkably disk-like at the current resolution and sensitivity. We use different weighting schemes with the visibilities to search for clumps on 0 ''.12. (similar to 1.0 kpc) scales, but we find no significant evidence for clumping in the majority of cases. Indeed, we demonstrate using simulations that the observed morphologies are generally consistent with smooth exponential disks, suggesting that caution should be exercised when identifying candidate clumps in even moderate signal-to-noise ratio interferometric data. We compare our maps to comparable-resolution Hubble Space Telescope H-160-band images, finding that the stellar morphologies appear significantly more extended and disturbed, and suggesting that major mergers may be responsible for driving the formation of the compact dust disks we observe. The stark contrast between the obscured and unobscured morphologies may also have implications for SED fitting routines that assume the dust is co-located with the optical/near-IR continuum emission. Finally, we discuss the potential of the current bursts of star formation to transform the observed galaxy sizes and light profiles, showing that the z similar to 0 descendants of these SMGs are expected to have stellar masses, effective radii, and gas surface densities consistent with the most compact massive (M* similar to 1-2 x 10(11) M-circle dot) early-type galaxies observed locally.

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Kiloparsec-Scale Dust Disks in High-Redshift Luminous Submillimeter Galaxies

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