Mon. Not. R. Astron. Soc., 466, 3161-3183 (2017/April-2)
Herschel far-infrared photometry of the Swift Burst Alert Telescope active galactic nuclei sample of the local universe - III. Global star-forming properties and the lack of a connection to nuclear activity.
SHIMIZU T.T., MUSHOTZKY R.F., MELENDEZ M., KOSS M.J., BARGER A.J. and COWIE L.L.
Abstract (from CDS):
We combine the HerschelSpace Observatory PACS (Photoconductor Array Camera and Spectrometer) and SPIRE (Spectral and Photometric Imaging Receiver) photometry with archival WISE (Wide-field Infrared Survey Explorer) photometry to construct the spectral energy distributions (SEDs) for over 300 local (z < 0.05), ultrahard X-ray (14-195 keV) selected active galactic nuclei (AGN) from the Swift Burst Alert Telescope (BAT) 58-month catalogue. Using a simple analytical model that combines an exponentially cutoff power law with a single temperature modified blackbody, we decompose the SEDs into a host galaxy and AGN component. We calculate dust masses, dust temperatures, and star formation rates (SFRs) for our entire sample and compare them to a stellar mass-matched sample of local non-AGN galaxies. We find AGN host galaxies have systematically higher dust masses, dust temperatures, and SFRs due to the higher prevalence of late-type galaxies to host an AGN, in agreement with previous studies of the Swift/BAT AGN. We provide a scaling to convert X-ray luminosities into 8-1000 µm AGN luminosities, as well as determine the best mid-to-far IR colours for identifying AGN-dominated galaxies in the IR regime. We find that for nearly 30 per cent of our sample, the 70 µm emission contains a significant contribution from the AGN (>0.5), especially at higher luminosities (L_14 - 195 keV_ > 1042.5 erg s–1). Finally, we measure the local SFR-AGN luminosity relationship, finding a slope of 0.18, large scatter (0.37 dex), and no evidence for an upturn at high AGN luminosity. We conclude with a discussion on the implications of our results within the context of galaxy evolution with and without AGN feedback.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
galaxies: active - galaxies: evolution - galaxies: Seyfert - galaxies: star formation - infrared: galaxies - infrared: galaxies
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<Available at CDS (J/MNRAS/466/3161): table1.dat>
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