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

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    The roles of star ... (741.2Kb)
    Identificadores
    URI: http://hdl.handle.net/10902/4815
    DOI: 10.1093/mnras/stt1177
    ISSN: 0035-8711
    ISSN: 1365-2966
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    Author
    Feltre, A.; Hatziminaoglou, Evanthia; Hernán Caballero, Antonio; Fritz, J.; Franceschini, Alberto; Bock, Jamie; Cooray, Asantha R.; Farrah, Duncan; González Solares, Eduardo A.; Ibar, Edo; Isaak, K. G.; Lo Faro, B.; Marchetti, L.; Oliver, Seb; Page, M.; Rigopoulou, Dimitra; Roseboom, I. G.; Symeonidis, M.; Vaccari, Mattia
    Date
    2013-09
    Derechos
    © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
    Publicado en
    Monthly Notices of the Royal Astronomical Society, vol. 434, iss.3, Pp.2426-2437 (2013)
    Publisher
    Oxford University Press
    Royal Astronomical Society
    Enlace a la publicación
    http://dx.doi.org/10.1093/mnras/stt1177
    Palabras clave
    Galaxies: active
    Galaxies: starburst
    Galaxies: star formation
    Infrared: galaxies
    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.
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    UNIVERSIDAD DE CANTABRIA

    Repositorio realizado por la Biblioteca Universitaria utilizando DSpace software
    Contact Us | Send Feedback
    Metadatos sujetos a:licencia de Creative Commons Reconocimiento 3.0 España