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Mid- to far-infrared properties of star-forming galaxies and active galactic nuclei

Magdis, G. E. and Rigopoulou, D. and Helou, G. and Farrah, D. and Hurley, P. and Alonso-Herrero, A. and Bock, J. J. and Burgarella, D. and Chapman, S. and Charmandaris, V. and Cooray, A. and Dai, Y. Sophia and Dale, D. A. and Elbaz, D. and Feltre, A. and Hatziminaoglou, E. and Huang, J.-S. and Morrison, G. and Oliver, S. and Page, M. and Scott, D. and Shi, Y. (2013) Mid- to far-infrared properties of star-forming galaxies and active galactic nuclei. Astronomy and Astrophysics, 558 . Art. No. A136. ISSN 0004-6361.

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We study the mid- to far-IR properties of a 24 μm-selected flux-limited sample (S_(24)> 5 mJy) of 154 intermediate redshift (⟨ z ⟩ ~ 0.15), infrared luminous galaxies, drawn from the 5 Milli-Jansky Unbiased Spitzer Extragalactic Survey. By combining existing mid-IR spectroscopy and new Herschel SPIRE submm photometry from the Herschel Multi-tiered Extragalactic Survey, we derived robust total infrared luminosity (L_(IR)) and dust mass (M_(dust)) estimates and infered the relative contribution of the AGN to the infrared energy budget of the sources. We found that the total (8−1000 μm) infrared emission of galaxies with weak 6.2 μm PAH emission (EW_(6.2) ≤ 0.2 μm) is dominated by AGN activity, while for galaxies with EW_(6.2)> 0.2 μm more than 50% of the L_(IR) arises from star formation. We also found that for galaxies detected in the 250–500 μm Herschel bands an AGN has a statistically insignificant effect on the temperature of the cold dust and the far-IR colours of the host galaxy, which are primarily shaped by star formation activity. For star-forming galaxies we reveal an anti-correlation between the L_(IR)-to-rest-frame 8 μm luminosity ratio, IR8 ≡ L_(IR)/L_8  and the strength of PAH features. We found that this anti-correlation is primarily driven by variations in the PAHs emission, and not by variations in the 5−15 μm mid-IR continuum emission. Using the [Ne iii]/[Ne ii] line ratio as a tracer of the hardness of the radiation field, we confirm that galaxies with harder radiation fields tend to exhibit weaker PAH features, and found that they have higher IR8 values and higher dust-mass-weighted luminosities (L_(IR)/M_(dust)), the latter being a proxy for the dust temperature (T_d). We argue that these trends originate either from variations in the environment of the star-forming regions or are caused by variations in the age of the starburst. Finally, we provide scaling relations that will allow estimating L_(IR), based on single-band observations with the mid-infrared instrument, on board the upcoming James Webb Space Telescope.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Magdis, G. E.0000-0002-4872-2294
Rigopoulou, D.0000-0001-6854-7545
Helou, G.0000-0003-3367-3415
Farrah, D.0000-0003-1748-2010
Alonso-Herrero, A.0000-0001-6794-2519
Bock, J. J.0000-0002-5710-5212
Charmandaris, V.0000-0002-2688-1956
Cooray, A.0000-0002-3892-0190
Dai, Y. Sophia0000-0002-7928-416X
Dale, D. A.0000-0002-5782-9093
Elbaz, D.0000-0002-7631-647X
Oliver, S.0000-0001-7862-1032
Page, M.0000-0002-6689-6271
Scott, D.0000-0002-6878-9840
Additional Information:© 2013 ESO. Article published by EDP Sciences. Received 8 July 2013. Accepted 23 August 2013. Published online 22 October 2013. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. GEM 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. VC acknowledges partial support from the EU FP7 Grant PIRSES-GA-20120316788. 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 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).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
John Fell Oxford University Press (OUP) Research FundUNSPECIFIED
University of OxfordUNSPECIFIED
Universidad de Cantabria August G. Linares ProgrammeUNSPECIFIED
European Research Council (ERC)PIRSES-GA-20120316788
Subject Keywords:galaxies: evolution, galaxies: active, galaxies: starburst, galaxies: star formation, infrared: galaxies
Record Number:CaltechAUTHORS:20140108-140820993
Persistent URL:
Official Citation:Mid- to far-infrared properties of star-forming galaxies and active galactic nuclei G. E. Magdis, D. Rigopoulou, G. Helou, D. Farrah, P. Hurley, A. Alonso-Herrero, J. Bock, D. Burgarella, S. Chapman, V. Charmandaris, A. Cooray, Y. Sophia Dai, D. Dale, D. Elbaz, A. Feltre, E. Hatziminaoglou, J.-S. Huang, G. Morrison, S. Oliver, M. Page, D. Scott and Y. Shi A&A 558 A136 (2013) DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43274
Deposited By: Ruth Sustaita
Deposited On:08 Jan 2014 22:46
Last Modified:09 Mar 2020 13:19

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