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        Cold dust emission from X-ray AGN in the SCUBA-2 Cosmology Legacy Survey : dependence on luminosity, obscuration & AGN activity

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        1509.00018v1 (PDF, 926Kb)
        Author
        Banerji, Manda
        McMahon, R.G.
        Willott, C.J.
        Geach, James
        Harrison, C. M.
        Alaghband-Zadeh, S.
        Alexander, D. M.
        Bourne, N.
        Coppin, Kristen
        Dunlop, J. S.
        Farrah, D.
        Jarvis, M.
        Michalowski, M. J.
        Page, M.
        Smith, Daniel
        Swinbank, A.M.
        Symeonidis, M.
        van der Werf, P. P.
        Attention
        2299/16793
        Abstract
        We study the 850um emission in X-ray selected AGN in the 2 sq-deg COSMOS field using new data from the SCUBA-2 Cosmology Legacy Survey. We find 19 850um bright X-ray AGN in a high-sensitivity region covering 0.89 sq-deg with flux densities of S850=4-10 mJy. The 19 AGN span the full range in redshift and hard X-ray luminosity covered by the sample - 0.7z43.2 1 X-ray AGN - S850=0.71+/-0.08mJy. We explore trends in the stacked 850um flux densities with redshift, finding no evolution in the average cold dust emission over the redshift range probed. For Type 1 AGN, there is no significant correlation between the stacked 850um flux and hard X-ray luminosity. However, in Type 2 AGN the stacked submm flux is a factor of 2 higher at high luminosities. When averaging over all X-ray luminosities, no significant differences are found in the stacked submm fluxes of Type 1 and Type 2 AGN as well as AGN separated on the basis of X-ray hardness ratios and optical-to-infrared colours. However, at log10(LX) >44.4, dependences in average submm flux on the optical-to-infrared colours become more pronounced. We argue that these high luminosity AGN represent a transition from a secular to a merger-driven evolutionary phase where the star formation rates and accretion luminosities are more tightly coupled. Stacked AGN 850um fluxes are compared to the stacked fluxes of a mass-matched sample of K-band selected non-AGN galaxies. We find that at 10.5 M0)
        Publication date
        2015-11-21
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stv1881
        Other links
        http://hdl.handle.net/2299/16793
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