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The Complex Physics of Dusty Star-forming Galaxies at High Redshifts as Revealed by Herschel and Spitzer

Lo Faro, B. and Bock, J. (2013) The Complex Physics of Dusty Star-forming Galaxies at High Redshifts as Revealed by Herschel and Spitzer. Astrophysical Journal, 762 (2). Art. No. 108. ISSN 0004-637X. doi:10.1088/0004-637X/762/2/108. https://resolver.caltech.edu/CaltechAUTHORS:20130205-104441854

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Abstract

We combine far-infrared photometry from Herschel (PEP/HerMES) with deep mid-infrared spectroscopy from Spitzer to investigate the nature and the mass assembly history of a sample of 31 luminous and ultraluminous infrared galaxies ((U)LIRGs) at z ~ 1 and 2 selected in GOODS-S with 24 μm fluxes between 0.2 and 0.5 mJy. We model the data with a self-consistent physical model (GRASIL) which includes a state-of-the-art treatment of dust extinction and reprocessing. We find that all of our galaxies appear to require massive populations of old (>1 Gyr) stars and, at the same time, to host a moderate ongoing activity of star formation (SFR ≤ 100 M_☉ yr^(–1)). The bulk of the stars appear to have been formed a few Gyr before the observation in essentially all cases. Only five galaxies of the sample require a recent starburst superimposed on a quiescent star formation history. We also find discrepancies between our results and those based on optical-only spectral energy distribution (SED) fitting for the same objects; by fitting their observed SEDs with our physical model we find higher extinctions (by ΔA_V ~ 0.81 and 1.14) and higher stellar masses (by Δlog(M_★) ~ 0.16 and 0.36 dex) for z ~ 1 and z ~ 2 (U)LIRGs, respectively. The stellar mass difference is larger for the most dust-obscured objects. We also find lower SFRs than those computed from L IR using the Kennicutt relation due to the significant contribution to the dust heating by intermediate-age stellar populations through "cirrus" emission (~73% and ~66% of the total L IR for z ~ 1 and z ~ 2 (U)LIRGs, respectively).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/762/2/108DOIUNSPECIFIED
http://iopscience.iop.org/0004-637X/762/2/108PublisherUNSPECIFIED
ORCID:
AuthorORCID
Bock, J.0000-0002-5710-5212
Additional Information:© 2013 American Astronomical Society. Received 2012 July 20; accepted 2012 November 19; published 2012 December 20. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. We acknowledge support from ASI (Herschel Science Contract I/005/11/0). PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KU Leuven, CSL, IMEC (Belgium); CEA, LAM(France); MPIA (Germany); INAF-IFSI/OAA/OAP/OAT, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy), and CICYT/MCYT (Spain). SPIRE has been developed by a consortium of institutes led by Cardiff Univ. (UK) and including: Univ. 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, Univ. 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)
Funders:
Funding AgencyGrant Number
ASI Herschel Science ContractI/005/11/0
BMVIT (Austria)UNSPECIFIED
ESA-PRODEX (Belgium)UNSPECIFIED
CEA/CNES (France)UNSPECIFIED
DLR (Germany)UNSPECIFIED
ASI/INAF (Italy)UNSPECIFIED
CICYT/MCYT (Spain)UNSPECIFIED
CSA (Canada)UNSPECIFIED
NAOC (China)UNSPECIFIED
CEA (France)UNSPECIFIED
CNES (France)UNSPECIFIED
CNRS (France)UNSPECIFIED
ASI (Italy)UNSPECIFIED
MCINN (Spain)UNSPECIFIED
SNSB (Sweden)UNSPECIFIED
STFC (UK)UNSPECIFIED
UKSA (UK)UNSPECIFIED
NASAUNSPECIFIED
Subject Keywords:galaxies: evolution; galaxies: general; galaxies: interactions; galaxies: starburst
Issue or Number:2
DOI:10.1088/0004-637X/762/2/108
Record Number:CaltechAUTHORS:20130205-104441854
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130205-104441854
Official Citation:The Complex Physics of Dusty Star-forming Galaxies at High Redshifts as Revealed by Herschel and Spitzer B. Lo Faro et al. 2013 ApJ 762 108
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36777
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:05 Feb 2013 19:04
Last Modified:09 Nov 2021 23:24

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