Physical conditions of the gas in an ALMA [C II]-identified submillimetre galaxy at z = 4.44

Huynh, M.T.; Norris, R.P.; Coppin, K.E.K.; Emonts, B.H.C.; Ivison, R.J.; Seymour, N.; Smail, I.; Smol\v ci&cacute;, V.; Swinbank, A.M.; Brandt, W.N.; Chapman, S.C.; Dannerbauer, H.; De Breuck, C.; Greve, T.R.; Hodge, J.A.; Karim, A.; Knudsen, K.K.; Menten, K.M.; van der Werf, P.P.; Walter, F.; Weiss, A.

doi:10.1093/mnrasl/slt014

Physical conditions of the gas in an ALMA [C II]-identified submillimetre galaxy at z = 4.44

Huynh, M.T.; Norris, R.P.; Coppin, K.E.K.; Emonts, B.H.C.; Ivison, R.J.; Seymour, N.; Smail, I.; Smol\v ci&cacute;, V.; Swinbank, A.M.; Brandt, W.N.; Chapman, S.C.; Dannerbauer, H.; De Breuck, C.; Greve, T.R.; Hodge, J.A.; Karim, A.; Knudsen, K.K.; Menten, K.M.; van der Werf, P.P.; Walter, F.; Weiss, A.

Authors

M.T. Huynh

R.P. Norris

K.E.K. Coppin

B.H.C. Emonts

R.J. Ivison

N. Seymour

Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor

V. Smol\v ci&cacute;

Professor Mark Swinbank a.m.swinbank@durham.ac.uk
Professor

W.N. Brandt

S.C. Chapman

H. Dannerbauer

C. De Breuck

T.R. Greve

J.A. Hodge

A. Karim

K.K. Knudsen

K.M. Menten

P.P. van der Werf

F. Walter

A. Weiss

Abstract

We present 12CO(2-1) observations of the submillimetre galaxy ALESS65.1 performed with the Australia Telescope Compact Array (ATCA) at 42.3 GHz. A previous Atacama Large Millimeter Array study of submillimetre galaxies (SMGs) in the Extended Chandra Deep Field South detected [C II] 157.74 μm emission from this galaxy at a redshift of z = 4.44. No 12CO(2-1) emission was detected but we derive a firm upper limit to the cold gas mass in ALESS65.1 of M_gas < 1.7 × 10^{10} M_{{⊙}}. The estimated gas depletion time-scale is <50 Myr, which is similar to other high-redshift SMGs, and consistent with z > 4 SMGs being the likely progenitors of massive red-and-dead galaxies at z > 2. The ratio of the [C II], 12CO and far-infrared luminosities implies a strong far-ultraviolet field of G0 ≳ 103, as seen in Galactic star-forming regions or local ultraluminous infrared galaxies (ULIRGs). The observed L_{[C II]}/L_FIR = 2.3 × 10^{-3} is high compared to local ULIRGs and, combined with L_{[C II]}/L_CO ≳ 2700, it is consistent with ALESS65.1 either having an extended (several kpc) [C II] emitting region or lower than solar metallicity.

Citation

Huynh, M., Norris, R., Coppin, K., Emonts, B., Ivison, R., Seymour, N., …Weiss, A. (2013). Physical conditions of the gas in an ALMA [C II]-identified submillimetre galaxy at z = 4.44. Monthly Notices of the Royal Astronomical Society, 431(1), L88-L92. https://doi.org/10.1093/mnrasl/slt014

Journal Article Type	Article
Publication Date	Apr 1, 2013
Deposit Date	May 10, 2013
Publicly Available Date	Jul 3, 2013
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	431
Issue	1
Pages	L88-L92
DOI	https://doi.org/10.1093/mnrasl/slt014
Keywords	Galaxies Evolution, Formation.

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This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2013 The Authors. Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.