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

Autori
Huynh, M.T. ; Norris, R.P. ; Coppin, K.E.K. ; Emonts, B.H.C. ; Ivison, R.J. ; Seymour, N. ; Smail, Ian ; Smolčić, Vernesa ; 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.

Izvornik
Monthly notices of the Royal Astronomical Society (0035-8711) 431 (2013), 1; L88-L92

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
galaxies: evolution; galaxies: formation

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA