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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693690.0, MPI für Astronomie / Publikationen_mpia
Physical conditions of the gas in an ALMA [C II]-identified submillimetre galaxy at z = 4.44
Authors:Huynh, M. T.; Norris, R. P.; Coppin, K. E. K.; Emonts, B. H. C.; Ivison, R. J.; Seymour, N.; Smail, I.; Smolčić, 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.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:1
Start Page:L88
End Page:L92
Audience:Not Specified
Abstract / Description: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.
Free Keywords:galaxies: evolution; galaxies: formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnrasl/slt014
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