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. https://resolver.caltech.edu/CaltechAUTHORS:20141212-102043065
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Abstract
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.
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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). | ||||||||||||||||||||||||||||
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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: | https://resolver.caltech.edu/CaltechAUTHORS:20141212-102043065 | ||||||||||||||||||||||||||||
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 | ||||||||||||||||||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||||
Deposited By: | Ruth Sustaita | ||||||||||||||||||||||||||||
Deposited On: | 12 Dec 2014 19:11 | ||||||||||||||||||||||||||||
Last Modified: | 09 Mar 2020 13:19 |
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