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

Manda Banerji, R.G. McMahon, C.J. Willott, James Geach, C. M. Harrison, S. Alaghband-Zadeh, D. M. Alexander, N. Bourne, Kristen Coppin, J. S. Dunlop, D. Farrah, M. Jarvis, M. J. Michalowski, M. Page, Daniel Smith, A.M. Swinbank, M. Symeonidis, P. P. van der Werf

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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)
Original languageEnglish
Pages (from-to)419-438
JournalMonthly Notices of the Royal Astronomical Society
Volume454
Issue number1
Early online date22 Sept 2015
DOIs
Publication statusPublished - 21 Nov 2015

Keywords

  • astro-ph.GA

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