THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ALMA RESOLVES THE REST-FRAME FAR-INFRARED EMISSION OF SUB-MILLIMETER GALAXIES

J. M. Simpson (7626983)
I. Smail (7599914)
A. M. Swinbank (7603247)
O. Almaini (7599896)
Andrew William Blain (7635698)
M. N. Bremer (7616156)
S. C. Chapman (7601474)
C-C. Chen (7673597)
C. Conselice (7651028)
K. E. K. Coppin (7603334)
A. L. R. Danielson (7672169)
J. S. Dunlop (7601381)
A. C. Edge (7603229)
D. Farrah (7600001)
J. E. Geach (7621910)
W. G. Hartley (7626974)
R. J. Ivison (7601480)
A. Karim (2691037)
C. Lani (7673600)
C-J. Ma (7626977)
R. Meijerink (7672163)
M. J. Michalowski (7604522)
A. Mortlock (7626980)
D. Scott (2582779)
C. J. Simpson (7628156)
M. Spaans (7654286)
A. P. Thomson (7673603)
E. van Kampen (7600046)
P. P. van der Werf (7651043)

Publication date

January 2015

Abstract

We present high-resolution (0farcs3) Atacama Large Millimeter Array 870 μm imaging of 52 sub-millimeter galaxies (SMGs) in the Ultra Deep Survey field to investigate the size and morphology of the sub-millimeter (sub-mm) emission on 2-10 kpc scales. We derive a median intrinsic angular size of FWHM = 0farcs30 ± 0farcs04 for the 23 SMGs in the sample detected at a signal-to-noise ratio (S/N) >10. Using the photometric redshifts of the SMGs we show that this corresponds to a median physical half-light diameter of 2.4 ± 0.2 kpc. A stacking analysis of the SMGs detected at S/N <10 shows they have sizes consistent with the 870 μm bright SMGs in the sample. We compare our results to the sizes of SMGs derived from other multi-wavelength studies, a...