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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 cić, 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.

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


M.T. Huynh

R.P. Norris

K.E.K. Coppin

B.H.C. Emonts

R.J. Ivison

N. Seymour

V. Smol\v cić

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


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.


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.

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
Keywords Galaxies Evolution, Formation.


Published Journal Article (226 Kb)

Copyright Statement
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.

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