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The nuclear and intergrated FIR emission of Seyfert galaxies

AuthorsGarcía-González, Judit
Issue Date2015
CitationTORUS 2015
AbstractWe present far-infrared (70-500micron) observations obtained with Herschel/PACS and SPIRE of 33 Seyfert galaxies from the Revised Shapley-Ames (RSA) catalogue. We selected these galaxies because they are nearby (median distance of 33Mpc) and have estimates of the nuclear and integrated star formation rates (SFR) from mid-infrared sub-arcsecond resolution and Spitzer/IRS spectroscopy, respectively. We measure the far-infrared nuclear (1kpc), 2kpc, and integrated spectral energy distributions (SEDs) from the Herschel images and estimate the unresolved nuclear emission at 70micron where Herschel provides the best angular resolution (median 0.9kpc). The goal is to select galaxies in our sample whose 70micron is mostly due to dust heated by the AGN. We will compare the 70micron emission together with existing nuclear 1-10micron SEDs and 8-13micron spectroscopy with clumpy torus model predictions. To estimate the AGN-produced 70micron emission we use a number of criteria. These include: (1) elevated nuclear 70/160 micron colours with respect to the typical colours of star forming galaxies, (2) 70micron excess emission with respect to the fit of the far-infrared SEDs with a grey body, (3) dust temperature higher than typical values of star forming galaxies, and (4) comparison of nuclear SFR obtained from 70 microns and mid-IR indicators.
DescriptionTrabajo presentado al Workshop TORUS: The unification scheme after 30 years, celebrado en Southampton (UK) del 14 al 17 de septiembre de 2015.
Appears in Collections:(IFCA) Comunicaciones congresos
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