Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/36550
Title: THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ALMA RESOLVES THE REST-FRAME FAR-INFRARED EMISSION OF SUB-MILLIMETER GALAXIES
Authors: Simpson, J. M.
Smail, I.
Swinbank, A. M.
Almaini, O.
Blain, Andrew William
Bremer, M. N.
Chapman, S. C.
Chen, C-C.
Conselice, C.
Coppin, K. E. K.
Danielson, A. L. R.
Dunlop, J. S.
Edge, A. C.
Farrah, D.
Geach, J. E.
Hartley, W. G.
Ivison, R. J.
Karim, A.
Lani, C.
Ma, C-J.
Meijerink, R.
Michalowski, M. J.
Mortlock, A.
Scott, D.
Simpson, C. J.
Spaans, M.
Thomson, A. P.
van Kampen, E.
van der Werf, P. P.
First Published: 16-Jan-2015
Publisher: IOP Publishing LTD
Citation: Astrophysical Journal, 2015, 799 (1), 81
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, and show that the rest-frame ~250 μm sizes of SMGs are consistent with studies of resolved [Superscript: 12]CO (J = 3-2 to 7-6) emission lines, but that sizes derived from 1.4 GHz imaging appear to be approximately two times larger on average, which we attribute to cosmic ray diffusion. The rest-frame optical sizes of SMGs are around four times larger than the sub-millimeter sizes, indicating that the star formation in these galaxies is compact relative to the pre-existing stellar distribution. The size of the starburst region in SMGs is consistent with the majority of the star formation occurring in a central region, a few kiloparsecs in extent, with a median star formation rate surface density of 90 ± 30 M ☉ yr[Superscript: –1] kpc[Superscript: –2], which may suggest that we are witnessing an intense period of bulge growth in these galaxies.
DOI Link: 10.1088/0004-637X/799/1/81
ISSN: 0004-637X
eISSN: 1538-4357
Links: http://iopscience.iop.org/article/10.1088/0004-637X/799/1/81/
http://hdl.handle.net/2381/36550
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2015. The American Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

Files in This Item:
File Description SizeFormat 
THE SCUBA-2 COSMOLOGY LEGACY SURVEY ALMA RESOLVES THE RESTFRAME FARINFRARED EMISSION OF SUBMILLIMETER GALAXIES.pdfPublished (publisher PDF)1.24 MBAdobe PDFView/Open


Items in LRA are protected by copyright, with all rights reserved, unless otherwise indicated.