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Herschel Observations of Far-infrared Cooling Lines in Intermediate Redshift (Ultra)-luminous Infrared Galaxies

Rigopoulou, D. and Hopwood, R. and Magdis, G. E. and Thatte, N. and Swinyard, B. M. and Farrah, D. and Huang, J.-S. and Alonso-Herrero, A. and Bock, J. J. and Clements, D. and Cooray, A. and Griffin, M. J. and Oliver, S. and Pearson, C. and Riechers, D. and Scott, D. and Smith, A. and Vaccari, M. and Valtchanov, I. and Wang, L. (2014) Herschel Observations of Far-infrared Cooling Lines in Intermediate Redshift (Ultra)-luminous Infrared Galaxies. Astrophysical Journal Letters, 781 (1). Art. No. L15. ISSN 2041-8205. doi:10.1088/2041-8205/781/1/L15.

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We report the first results from a spectroscopic survey of the [C II] 158 μm line from a sample of intermediate redshift (0.2 <z < 0.8) (ultra)-luminous infrared galaxies, (U)LIRGs (L_(IR) > 10^(11.5) L_☉), using the Spectral and Photometric Imaging REceiver-Fourier Transform Spectrometer on board the Herschel Space Observatory. This is the first survey of [C II] emission, an important tracer of star formation, at a redshift range where the star formation rate density of the universe increases rapidly. We detect strong [C II] 158 μm line emission from over 80% of the sample. We find that the [C II] line is luminous, in the range (0.8-4) × 10^(–3) of the far-infrared continuum luminosity of our sources, and appears to arise from photodissociation regions on the surface of molecular clouds. The L [C_(II)]/L_(IR) ratio in our intermediate redshift (U)LIRGs is on average ~10 times larger than that of local ULIRGs. Furthermore, we find that the L [C_(II)]/L_(IR) and L [C_(II)]/L_(CO(1-0)) ratios in our sample are similar to those of local normal galaxies and high-z star-forming galaxies. ULIRGs at z ~ 0.5 show many similarities to the properties of local normal and high-z star-forming galaxies. Our findings strongly suggest that rapid evolution in the properties of the star-forming regions of (U)LIRGs is likely to have occurred in the last 5 billion years.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Rigopoulou, D.0000-0001-6854-7545
Magdis, G. E.0000-0002-4872-2294
Farrah, D.0000-0003-1748-2010
Alonso-Herrero, A.0000-0001-6794-2519
Bock, J. J.0000-0002-5710-5212
Clements, D.0000-0002-9548-5033
Cooray, A.0000-0002-3892-0190
Oliver, S.0000-0001-7862-1032
Riechers, D.0000-0001-9585-1462
Scott, D.0000-0002-6878-9840
Smith, A.0000-0002-1938-4660
Vaccari, M.0000-0002-6748-0577
Valtchanov, I.0000-0001-9930-7886
Additional Information:© 2014 American Astronomical Society. Received 2013 October 11; accepted 2013 December 6; published 2014 January 6. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. We thank the anonymous referee for his/her insightful comments. D.R. and G.E.M. acknowledge support from grant ST/K00106X/1 and the John Fell Oxford University Press (OUP) Research Fund (G.E.M.). This Letter is based on data from Herschel’s SPIRE-FTS. SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including: University of Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, University of Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, University of Sussex (UK); and Caltech, JPL, NHSC, University of Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC, UKSA (UK); and NASA (USA). Facilities: Herschel, IRAM:30m, APEX
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)ST/K00106X/1
John Fell Oxford University Press (OUP) Research FundUNSPECIFIED
Canadian Space Agency (CSA)UNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
United Kingdom Space Agency (UKSA)UNSPECIFIED
Subject Keywords: galaxies: starburst; infrared: galaxies; infrared: ISM
Issue or Number:1
Record Number:CaltechAUTHORS:20140211-111507479
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Official Citation:Herschel Observations of Far-infrared Cooling Lines in Intermediate Redshift (Ultra)-luminous Infrared Galaxies D. Rigopoulou et al. 2014 ApJ 781 L15
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43776
Deposited By: Ruth Sustaita
Deposited On:11 Feb 2014 19:38
Last Modified:10 Nov 2021 16:43

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