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Herschel and SCUBA-2 imaging and spectroscopy of a bright, lensed submillimetre galaxy at z = 2.3.

Ivison, R.J. and Swinbank, A.M. and Swinyard, B. and Smail, I. and Pearson, C.P. and Rigopoulou, D. and Polehampton, E. and Baluteau, J.-P. and Barlow, M.J. and Blain, A.W. and Bock, J. and Clements, D.L. and Coppin, K. and Cooray, A. and Danielson, A. and Dwek, E. and Edge, A.C. and Franceschini, A. and Fulton, T. and Glenn, J. and Griffin, M. and Isaak, K. and Leeks, S. and Lim, T. and Naylor, D. and Oliver, S.J. and Page, M.J. and Pérez Fournon, I. and Rowan-Robinson, M. and Savini, G. and Scott, D. and Spencer, L. and Valtchanov, I. and Vigroux, L. and Wright, G.S. (2010) 'Herschel and SCUBA-2 imaging and spectroscopy of a bright, lensed submillimetre galaxy at z = 2.3.', Astronomy & astrophysics., 518 . L35.


We present a detailed analysis of the far-infrared (-IR) properties of the bright, lensed, z = 2.3, submillimetre-selected galaxy (SMG), SMM J2135-0102 (hereafter SMM J2135), using new observations with Herschel, SCUBA-2 and the Very Large Array (VLA). These data allow us to constrain the galaxy's spectral energy distribution (SED) and show that it has an intrinsic rest-frame 8-1000-μm luminosity, Lbol, of (2.3±0.2) × 1012 and a likely star-formation rate (SFR) of ~400 yr-1. The galaxy sits on the far-IR/radio correlation for far-IR-selected galaxies. At 70 μm, the SED can be described adequately by dust components with dust temperatures, Td ~ 30 and 60 k. Using SPIRE's Fourier- transform spectrometer (FTS) we report a detection of the [C ii] 158 μm cooling line. If the [C ii], CO and far-IR continuum arise in photo-dissociation regions (PDRs), we derive a characteristic gas density, n ~ 103 cm-3, and a far-ultraviolet (-UV) radiation field, G0, 103× stronger than the Milky Way. L[CII]/Lbol is significantly higher than in local ultra-luminous IR galaxies (ULIRGs) but similar to the values found in local star-forming galaxies and starburst nuclei. This is consistent with SMM J2135 being powered by starburst clumps distributed across ~2 kpc, evidence that SMGs are not simply scaled-up ULIRGs. Our results show that SPIRE's FTS has the ability to measure the redshifts of distant, obscured galaxies via the blind detection of atomic cooling lines, but it will not be competitive with ground-based CO-line searches. It will, however, allow detailed study of the integrated properties of high-redshift galaxies, as well as the chemistry of their interstellar medium (ISM), once more suitably bright candidates have been found.

Item Type:Article
Keywords:Galaxies, Evolution, Infrared, ISM, Radio continuum, Submillimeter.
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Date accepted:No date available
Date deposited:14 June 2013
Date of first online publication:July 2010
Date first made open access:No date available

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