The roles of star formation and AGN activity of IRS sources in the HerMES fields

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dc.contributor.authorFeltre, Anna
dc.contributor.authorHatziminaoglou, Evanthia
dc.contributor.authorVaccari, Mattia
dc.contributor.authorHernán-Caballero, Antonio
dc.contributor.authorFritz, Jacopo
dc.contributor.authorFranceschini, Alberto
dc.contributor.authorBock, J.
dc.contributor.authorCooray, Asantha
dc.contributor.authorFarrah, Duncan
dc.contributor.authorGonzalez-Solares, Eduardo A.
dc.contributor.authorIbar, Edo
dc.contributor.authorIsaak, Kate G.
dc.contributor.authorLo Faro, Barbara
dc.contributor.authorMarchetti, L.
dc.contributor.authorOliver, Seb J.
dc.contributor.authorPage, Matthew J.
dc.contributor.authorRigopoulou, Dimitra
dc.contributor.authorRoseboom, Isaac G.
dc.contributor.authorSymeonidis, Myrto
dc.date.accessioned2017-07-13T14:08:40Z
dc.date.available2017-07-13T14:08:40Z
dc.date.issued2013
dc.description.abstractIn this work we explore the impact of the presence of an active galactic nucleus (AGN) on the mid- and far-infrared (IR) properties of galaxies as well as the effects of simultaneous AGN and starburst activity in these same galaxies. To do this we apply a multi-component, multi-band spectral synthesis technique to a sample of 250 μm selected galaxies of the HerschelMulti- tiered Extragalactic Survey (HerMES), with IRS spectra available for all galaxies. Our results confirm that the inclusion of the IRS spectra plays a crucial role in the spectral analysis of galaxies with an AGN component improving the selection of the best-fit hot dust (torus) model. We find a correlation between the obscured star formation rate (SFR) derived from the IR luminosity of the starburst component, SFRIR and SFRPAH, derived from the luminosity of the PAH features, LPAH, with SFRFIR taking higher values than SFRPAH. The correlation is different for AGN- and starburst-dominated objects. The ratio of LPAH to that of the starburst component, LPAH/LSB, is almost constant for AGN-dominated objects but decreases with increasing LSB for starburst-dominated objects. SFRFIR increases with the accretion luminosity, Lacc, with the increase less prominent for the very brightest, unobscured AGN-dominated sources. We find no correlation between the masses of the hot (AGN-heated) and cold (starburstheated) dust components. We interpret this as a non-constant fraction of gas driven by the gravitational effects to the AGN while the starburst is ongoing. We also find no evidence of the AGN affecting the temperature of the cold dust component, though this conclusion is mostly based on objects with a non-dominantAGN component.We conclude that our findings do not provide evidence that the presence of AGN affects the star formation process in the host galaxy, but rather that the two phenomena occur simultaneously over a wide range of luminosities.en_US
dc.description.accreditationDepartment of HE and Training approved list
dc.identifier.citationFeltre, A. et al. (2013). The roles of star formation and AGN activity of IRS sources in the HerMES fields. Monthly Notices of the Royal Astronomical Society, 434 (3): 2426-2437en_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/10566/3075
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.rightsPublisher retains copyright. Authors may archive the published version in their institutional repository.
dc.source.urihttps://dx.doi.org/10.1093/mnras/stt1177
dc.subjectGalaxiesen_US
dc.subjectActive - galaxiesen_US
dc.subjectStarburst – galaxiesen_US
dc.subjectStar formation – infrareden_US
dc.titleThe roles of star formation and AGN activity of IRS sources in the HerMES fieldsen_US
dc.typeArticleen_US

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