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A Far-Infrared Spectroscopic Survey of Intermediate Redshift (Ultra) Luminous Infrared Galaxies

Magdis, Georgios E. and Rigopoulou, D. and Hopwood, R. and Huang, J.-S. and Farrah, D. and Pearson, C. and Alonso-Herrera, Almudena and Bock, J. J. and Clements, D. and Cooray, A. and Griffin, M. J. and Oliver, S. and Pérez-Fournon, I. and Riechers, D. and Swinyard, B. M. and Scott, D. and Thatte, N. and Valtchanov, I. and Vaccari, M. (2014) A Far-Infrared Spectroscopic Survey of Intermediate Redshift (Ultra) Luminous Infrared Galaxies. Astrophysical Journal, 796 (1). Art. No. 63. ISSN 0004-637X. doi:10.1088/0004-637X/796/1/63.

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We present Herschel far-IR photometry and spectroscopy as well as ground-based CO observations of an intermediate redshift (0.21 ≤ z ≤ 0.88) sample of Herschel-selected (ultra)-luminous infrared galaxies (L_(IR) > 10^(11.5) L_☉). With these measurements, we trace the dust continuum, far-IR atomic line emission, in particular [C II] 157.7 μm, as well as the molecular gas of z ~ 0.3 luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) and perform a detailed investigation of the interstellar medium of the population. We find that the majority of Herschel-selected intermediate redshift (U)LIRGs have L_(CII)/L_(FIR) ratios that are a factor of about 10 higher than that of local ULIRGs and comparable to that of local normal and high-z star-forming galaxies. Using our sample to bridge local and high-z [C II] observations, we find that the majority of galaxies at all redshifts and all luminosities follow an L_(CII) –L_(FIR) relation with a slope of unity, from which local ULIRGs and high- z active-galactic-nucleus-dominated sources are clear outliers. We also confirm that the strong anti-correlation between the L_(CII)/L_(FIR) ratio and the far-IR color L_0/L_(100) observed in the local universe holds over a broad range of redshifts and luminosities, in the sense that warmer sources exhibit lower L_(CII)/L_(FIR) at any epoch. Intermediate redshift ULIRGs are also characterized by large molecular gas reservoirs and by lower star formation efficiencies compared to that of local ULIRGs. The high L_(CII)/L_(FIR) ratios, the moderate star formation efficiencies (L_(IR)/L'_(CO) or L_(IR/M_(H_2), and the relatively low dust temperatures of our sample (which are also common characteristics of high-z star-forming galaxies with ULIRG-like luminosities) indicate that the evolution of the physical properties of (U)LIRGs between the present day and z > 1 is already significant by z ~ 0.3.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Magdis, Georgios E.0000-0002-4872-2294
Rigopoulou, D.0000-0001-6854-7545
Farrah, D.0000-0003-1748-2010
Pearson, C.0000-0001-6139-649X
Alonso-Herrera, Almudena0000-0001-6794-2519
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
Valtchanov, I.0000-0001-9930-7886
Vaccari, M.0000-0002-6748-0577
Additional Information:© 2014 American Astronomical Society. Received 2014 June 18; accepted 2014 September 16; published 2014 November 5. We warmly thank the referee for constructive comments and suggestions. G.E.M. and D.R. acknowledge support from STFC through grant ST/K00106X/1. G.E.M. acknowledges support from the John Fell Oxford University Press (OUP) Research Fund and the University of Oxford. A.A.-H. acknowledges funding through the Universidad de Cantabria August G. Linares Programme. This work includes observations made with IRAM, which is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain). Based on observations made with ESO Telescopes at the APEX Observatory under programme ID 090.B-0708A and 091.B-0312A. This paper uses data from Herschel’s photometer SPIRE. 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, Univ. Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, Univ. Sussex (UK); and Caltech, JPL, NHSC, University of Colorado (USA).
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)ST/K00106X/1
University of Oxford John Fell Oxford University Press (OUP) Research FundUNSPECIFIED
Universidad de Cantabria August G. Linares ProgrammeUNSPECIFIED
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Instituto Geográfico Nacional (IGN)UNSPECIFIED
Subject Keywords:galaxies: evolution; galaxies: star formation; gamma rays: ISM; infrared: galaxies; infrared: general
Issue or Number:1
Record Number:CaltechAUTHORS:20141212-102043065
Persistent URL:
Official Citation:A Far-Infrared Spectroscopic Survey of Intermediate Redshift (Ultra) Luminous Infrared Galaxies Georgios E. Magdis et al. 2014 ApJ 796 63
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52624
Deposited By: Ruth Sustaita
Deposited On:12 Dec 2014 19:11
Last Modified:10 Nov 2021 19:43

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