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

dc.contributorVirginia Techen
dc.contributor.authorMagdis, G. E.en
dc.contributor.authorRigopoulou, D.en
dc.contributor.authorHelou, G.en
dc.contributor.authorFarrah, D.en
dc.contributor.authorHurley, P.en
dc.contributor.authorAlonso-Herrero, A.en
dc.contributor.authorBock, J.en
dc.contributor.authorBurgarella, D.en
dc.contributor.authorChapman, S.en
dc.contributor.authorCharmandaris, V.en
dc.contributor.authorCooray, A.en
dc.contributor.authorDai, Y. S.en
dc.contributor.authorDale, D.en
dc.contributor.authorElbaz, D.en
dc.contributor.authorFeltre, A.en
dc.contributor.authorHatziminaoglou, E.en
dc.contributor.authorHuang, J. S.en
dc.contributor.authorMorrison, G.en
dc.contributor.authorOliver, S.en
dc.contributor.authorPage, M.en
dc.contributor.authorScott, D.en
dc.contributor.authorShi, Y.en
dc.contributor.departmentPhysicsen
dc.date.accessed2014-05-08en
dc.date.accessioned2014-05-14T17:03:34Zen
dc.date.available2014-05-14T17:03:34Zen
dc.date.issued2013-10en
dc.description.abstractWe study the mid- to far-IR properties of a 24 mu m-selected flux-limited sample (S-24 > 5mJy) of 154 intermediate redshift (< z > similar to 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 mu m) infrared emission of galaxies with weak 6.2 mu m PAH emission (EW6.2 <= 0.2 mu m) is dominated by AGN activity, while for galaxies with EW6.2 > 0.2 mu m more than 50% of the L-IR arises from star formation. We also found that for galaxies detected in the 250-500 mu m 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 mu m 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 mu m mid-IR continuum emission. Using the [NeIII]/[NeII] 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.en
dc.description.sponsorshipJohn Fell Oxford University Press (OUP)en
dc.description.sponsorshipUniversity of Oxforden
dc.description.sponsorshipUniversidad de Cantabria August G. Linares Programmeen
dc.description.sponsorshipEU PIRSES-GA-20120316788en
dc.identifier.citationMagdis, G. E., et al., "Mid- to far-infrared properties of star-forming galaxies and active galactic nuclei," A&A 558, A136 (2013). DOI: 10.1051/0004-6361/201322226en
dc.identifier.doihttps://doi.org/10.1051/0004-6361/201322226en
dc.identifier.issn0004-6361en
dc.identifier.urihttp://hdl.handle.net/10919/48021en
dc.identifier.urlhttp://www.aanda.org/articles/aa/abs/2013/10/aa22226-13/aa22226-13.htmlen
dc.language.isoen_USen
dc.publisherEDP SCIENCESen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectgalaxies: evolutionen
dc.subjectgalaxies: activeen
dc.subjectgalaxies: starbursten
dc.subjectgalaxies:en
dc.subjectstar formationen
dc.subjectinfrared: galaxiesen
dc.subjectspitzer-space-telescopeen
dc.subjectspectral energy-distributionsen
dc.subjectpolycyclicen
dc.subjectaromatic-hydrocarbonsen
dc.subjectneed ultraviolet excitationen
dc.subjectpalomar-greenen
dc.subjectquasarsen
dc.subjectpower-law galaxiesen
dc.subjectdeep-field-southen
dc.subjectmidinfrared spectroscopyen
dc.subjectinterstellar-mediumen
dc.subjectluminous galaxiesen
dc.subjectastronomy & astrophysicsen
dc.titleMid- to far-infrared properties of star-forming galaxies and active galactic nucleien
dc.title.serialAstronomy & Astrophysicsen
dc.typeArticle - Refereeden
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