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

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    Identificadores
    URI: http://hdl.handle.net/10902/4393
    DOI: 10.1051/0004-6361/201322226
    ISSN: 0004-6361
    ISSN: 1432-0746
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    Author
    Magdis, Georgios E.; Rigopoulou, Dimitra; Helou , George; Farrah, Duncan; Hurley, Pete; Alonso Herrero, Almudena; Bock , Jamie; Burgarella, Denis; Chapman, Scott; Charmandaris, Vassilis; Cooray, Asantha R.; Dai, Sophia; Dale, Daniel A.; Elbaz, David; Feltre, A.; Hatziminaoglou, Evanthia; Huang, Jiasheng; Morrison, Glenn E.; Oliver, Seb; [et al.]
    Date
    2013-10
    Derechos
    © ESO, 2013
    Publicado en
    Astronomy and Astrophysics, vol. 558, art. num. A136, (2013)
    Publisher
    EDP Sciences
    Enlace a la publicación
    http://dx.doi.org/10.1051/0004-6361/201322226
    Palabras clave
    Galaxies: evolution
    Galaxies: active
    Galaxies: starburst
    Galaxies: star formation
    Infrared: galaxies
    Abstract:
    We study the mid- to far-IR properties of a 24 μm-selected flux-limited sample (S24> 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 (LIR) and dust mass (Mdust) 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 (EW6.2 ≤ 0.2 μm) is dominated by AGN activity, while for galaxies with EW6.2> 0.2 μm more than 50% of the LIR 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 LIR-to-rest-frame 8 μm luminosity ratio, IR8 ≡ LIR/L8  and the strength of PAH features. We found that this anti-correlation is primarily driven by variations in the PAHsemission, 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 (LIR/Mdust), the latter being a proxy for the dust temperature (Td). 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 LIR, based on single-band observations with the mid-infrared instrument, on board the upcoming James Webb Space Telescope.
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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