eprintid: 1406146 rev_number: 35 eprint_status: archive userid: 608 dir: disk0/01/40/61/46 datestamp: 2013-09-17 18:54:37 lastmod: 2021-09-19 23:46:40 status_changed: 2018-03-01 16:02:25 type: article metadata_visibility: show item_issues_count: 0 creators_name: Feltre, A creators_name: Hatziminaoglou, E creators_name: Hernan-Caballero, A creators_name: Fritz, J creators_name: Franceschini, A creators_name: Bock, J creators_name: Cooray, A creators_name: Farrah, D creators_name: Solares, EAG creators_name: Ibar, E creators_name: Isaak, KG creators_name: Lo Faro, B creators_name: Marchetti, L creators_name: Oliver, SJ creators_name: Page, MJ creators_name: Rigopoulou, D creators_name: Roseboom, IG creators_name: Symeonidis, M creators_name: Vaccari, M title: The roles of star formation and AGN activity of IRS sources in the HerMES fields ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F63 keywords: ULTRALUMINOUS INFRARED GALAXIES, SPITZER-SPACE-TELESCOPE, SPECTRAL ENERGY-DISTRIBUTIONS, DIGITAL-SKY-SURVEY, SUPERMASSIVE BLACK-HOLES, PALOMAR-GREEN QUASARS, SIMILAR-TO 2, GALACTIC NUCLEI, MIDINFRARED SPECTROSCOPY, STARBURST GALAXIES, galaxies: active, galaxies: starburst, galaxies: star formation, infrared: galaxies note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. abstract: In 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 the same galaxies. To do this, we apply a multicomponent, multiband spectral synthesis technique to a sample of 250 μm selected galaxies of the Herschel Multi-tiered Extragalactic Survey (HerMES), with Infrared Spectrograph (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-fitting hot dust (torus) model. We find a correlation between the obscured star formation rate, SFRIR, derived from the IR luminosity of the starburst component, 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 (starburst-heated) 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-dominant AGN 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. date: 2013-09-01 date_type: published publisher: OXFORD UNIV PRESS official_url: http://dx.doi.org/10.1093/mnras/stt1177 vfaculties: VMPS oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green article_type_text: Article verified: verified_manual elements_source: Scopus elements_id: 884157 doi: 10.1093/mnras/stt1177 lyricists_name: Page, Mathew lyricists_name: Symeonidis, Myrto lyricists_id: MJPAG55 lyricists_id: MSYME08 actors_name: Dustmann, Christian actors_name: Dewerpe, Marie actors_id: CDUST02 actors_id: MDDEW97 actors_role: owner actors_role: impersonator full_text_status: public publication: Monthly Notices of the Royal Astronomical Society volume: 434 number: 3 pagerange: 2426-2437 pages: 12 issn: 0035-8711 citation: Feltre, A; Hatziminaoglou, E; Hernan-Caballero, A; Fritz, J; Franceschini, A; Bock, J; Cooray, A; ... Vaccari, M; + view all <#> Feltre, A; Hatziminaoglou, E; Hernan-Caballero, A; Fritz, J; Franceschini, A; Bock, J; Cooray, A; Farrah, D; Solares, EAG; Ibar, E; Isaak, KG; Lo Faro, B; Marchetti, L; Oliver, SJ; Page, MJ; Rigopoulou, D; Roseboom, IG; Symeonidis, M; Vaccari, M; - view fewer <#> (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) pp. 2426-2437. 10.1093/mnras/stt1177 <https://doi.org/10.1093/mnras%2Fstt1177>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1406146/1/Page_stt1177.pdf