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

Manda Banerji; R. G. McMahon; C. J. Willott; J. E. Geach; C. M. Harrison; S. Alaghband-Zadeh; D. M. Alexander; N. Bourne; K. E. K. Coppin; J. S. Dunlop; D. Farrah; M. Jarvis; M. J. Michałowski; M. Page; D. J. B. Smith; A. M. Swinbank; M. Symeonidis; P. P. van der Werf

doi:10.1093/mnras/stv1881

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

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

School of Physics and Astronomy

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Abstract

We study the 850-μm emission in X-ray-selected active galactic nuclei (AGN) in the ˜2 deg2 COSMOS field using new data from the SCUBA-2 Cosmology Legacy Survey. We find 19 850-μm bright X-ray AGN in a `high-sensitivity' region covering 0.89 deg2 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 - 0.7 ≲ z ≲ 3.5 and 43.2 ≲ log10(LX) ≲ 45. We report a highly significant stacked 850-μm detection of a hard X-ray flux-limited population of 699 z > 1 X-ray AGN - S850 = 0.71 ± 0.08 mJy. We explore trends in the stacked 850-μm 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 850-μm flux and hard X-ray luminosity. However, in type 2 AGN the stacked submillimeter 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 submillimeter 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(L2 - 10/erg s-1) > 44.4, dependences in average submillimeter 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 850-μm 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

Original language	English
Pages (from-to)	419-438
Number of pages	20
Journal	Monthly Notices of the Royal Astronomical Society
Volume	454
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stv1881
Publication status	Published - 1 Nov 2015

Keywords

quasars: general
X-rays: galaxies
galaxies: evolution
submillimetre: galaxies

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10.1093/mnras/stv1881

http://adsabs.harvard.edu/abs/2015MNRAS.454..419B

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Banerji, M., McMahon, R. G., Willott, C. J., Geach, J. E., Harrison, C. M., Alaghband-Zadeh, S., Alexander, D. M., Bourne, N., Coppin, K. E. K., Dunlop, J. S., Farrah, D., Jarvis, M., Michałowski, M. J., Page, M., Smith, D. J. B., Swinbank, A. M., Symeonidis, M., & van der Werf, P. P. (2015). Cold dust emission from X-ray AGN in the SCUBA-2 Cosmology Legacy Survey: dependence on luminosity, obscuration and AGN activity. Monthly Notices of the Royal Astronomical Society, 454(1), 419-438. https://doi.org/10.1093/mnras/stv1881

@article{51242418670f4b8ebfe77b7d83db23c0,

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

abstract = "We study the 850-μm emission in X-ray-selected active galactic nuclei (AGN) in the ˜2 deg2 COSMOS field using new data from the SCUBA-2 Cosmology Legacy Survey. We find 19 850-μm bright X-ray AGN in a `high-sensitivity' region covering 0.89 deg2 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 - 0.7 ≲ z ≲ 3.5 and 43.2 ≲ log10(LX) ≲ 45. We report a highly significant stacked 850-μm detection of a hard X-ray flux-limited population of 699 z > 1 X-ray AGN - S850 = 0.71 ± 0.08 mJy. We explore trends in the stacked 850-μm 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 850-μm flux and hard X-ray luminosity. However, in type 2 AGN the stacked submillimeter 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 submillimeter 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(L2 - 10/erg s-1) > 44.4, dependences in average submillimeter 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 850-μm 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 ",

keywords = "quasars: general, X-rays: galaxies, galaxies: evolution, submillimetre: galaxies",

author = "Manda Banerji and McMahon, {R. G.} and Willott, {C. J.} and Geach, {J. E.} and Harrison, {C. M.} and S. Alaghband-Zadeh and Alexander, {D. M.} and N. Bourne and Coppin, {K. E. K.} and Dunlop, {J. S.} and D. Farrah and M. Jarvis and Micha{\l}owski, {M. J.} and M. Page and Smith, {D. J. B.} and Swinbank, {A. M.} and M. Symeonidis and {van der Werf}, {P. P.}",

year = "2015",

month = nov,

day = "1",

doi = "10.1093/mnras/stv1881",

language = "English",

volume = "454",

pages = "419--438",

journal = "Monthly Notices of the Royal Astronomical Society ",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

Banerji, M, McMahon, RG, Willott, CJ, Geach, JE, Harrison, CM, Alaghband-Zadeh, S, Alexander, DM, Bourne, N, Coppin, KEK, Dunlop, JS, Farrah, D, Jarvis, M, Michałowski, MJ, Page, M, Smith, DJB, Swinbank, AM, Symeonidis, M & van der Werf, PP 2015, 'Cold dust emission from X-ray AGN in the SCUBA-2 Cosmology Legacy Survey: dependence on luminosity, obscuration and AGN activity', Monthly Notices of the Royal Astronomical Society, vol. 454, no. 1, pp. 419-438. https://doi.org/10.1093/mnras/stv1881

TY - JOUR

T1 - Cold dust emission from X-ray AGN in the SCUBA-2 Cosmology Legacy Survey: dependence on luminosity, obscuration and AGN activity

AU - Banerji, Manda

AU - McMahon, R. G.

AU - Willott, C. J.

AU - Geach, J. E.

AU - Harrison, C. M.

AU - Alaghband-Zadeh, S.

AU - Alexander, D. M.

AU - Bourne, N.

AU - Coppin, K. E. K.

AU - Dunlop, J. S.

AU - Farrah, D.

AU - Jarvis, M.

AU - Michałowski, M. J.

AU - Page, M.

AU - Smith, D. J. B.

AU - Swinbank, A. M.

AU - Symeonidis, M.

AU - van der Werf, P. P.

PY - 2015/11/1

Y1 - 2015/11/1

N2 - We study the 850-μm emission in X-ray-selected active galactic nuclei (AGN) in the ˜2 deg2 COSMOS field using new data from the SCUBA-2 Cosmology Legacy Survey. We find 19 850-μm bright X-ray AGN in a `high-sensitivity' region covering 0.89 deg2 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 - 0.7 ≲ z ≲ 3.5 and 43.2 ≲ log10(LX) ≲ 45. We report a highly significant stacked 850-μm detection of a hard X-ray flux-limited population of 699 z > 1 X-ray AGN - S850 = 0.71 ± 0.08 mJy. We explore trends in the stacked 850-μm 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 850-μm flux and hard X-ray luminosity. However, in type 2 AGN the stacked submillimeter 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 submillimeter 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(L2 - 10/erg s-1) > 44.4, dependences in average submillimeter 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 850-μm 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

AB - We study the 850-μm emission in X-ray-selected active galactic nuclei (AGN) in the ˜2 deg2 COSMOS field using new data from the SCUBA-2 Cosmology Legacy Survey. We find 19 850-μm bright X-ray AGN in a `high-sensitivity' region covering 0.89 deg2 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 - 0.7 ≲ z ≲ 3.5 and 43.2 ≲ log10(LX) ≲ 45. We report a highly significant stacked 850-μm detection of a hard X-ray flux-limited population of 699 z > 1 X-ray AGN - S850 = 0.71 ± 0.08 mJy. We explore trends in the stacked 850-μm 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 850-μm flux and hard X-ray luminosity. However, in type 2 AGN the stacked submillimeter 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 submillimeter 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(L2 - 10/erg s-1) > 44.4, dependences in average submillimeter 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 850-μm 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

KW - quasars: general

KW - X-rays: galaxies

KW - galaxies: evolution

KW - submillimetre: galaxies

U2 - 10.1093/mnras/stv1881

DO - 10.1093/mnras/stv1881

M3 - Article

VL - 454

SP - 419

EP - 438

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -

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

Abstract

Keywords

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