HerMES: SPIRE emission from radio-selected active galactic nuclei
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Author
Seymour, N.
Symeonidis, M.
Page, M. J.
Amblard, A.
Arumugam, V.
Aussel, H.
Blain, A.
Bock, J.
Boselli, A.
Buat, V.
Castro-Rodriguez, N.
Cava, A.
Chanial, P.
Clements, D. L.
Conley, A.
Conversi, L.
Cooray, A.
Dowell, C. D.
Dwek, E.
Eales, S.
Elbaz, D.
Franceschini, A.
Glenn, J.
Solares, E. A. Gonzalez
Griffin, M.
Hatziminaoglou, E.
Ibar, E.
Isaak, K.
Ivison, R. J.
Lagache, G.
Levenson, L.
Lu, N.
Madden, S.
Maffei, B.
Mainetti, G.
Marchetti, L.
Nguyen, H. T.
O'Halloran, B.
Oliver, S. J.
Omont, A.
Panuzzo, P.
Papageorgiou, A.
Pearson, C. P.
Perez-Fournon, I.
Pohlen, M.
Rawlings, J. I.
Rizzo, D.
Roseboom, I. G.
Rowan-Robinson, M.
Schulz, B.
Scott, Douglas
Shupe, D. L.
Smith, A. J.
Stevens, J. A.
Trichas, M.
Tugwell, K. E.
Vaccari, M.
Valtchanov, I.
Vigroux, L.
Wang, L.
Wright, G.
Xu, C. K.
Zemcov, M.
Attention
2299/6442
Abstract
We examine the rest-frame far-infrared emission from powerful radio sources with 1.4-GHz luminosity densities of 25 < log(L-1.4/W Hz-1) < 26.5 in the extragalactic Spitzer First Look Survey field. We combine Herschel/SPIRE flux densities with Spitzer/Infrared Array Camera and Multiband Imaging Photometer for Spitzer infrared data to obtain total (<file name="mnr_18253_mu1.gif" type="gif"/>m) infrared luminosities for these radio sources. We separate our sources into a moderate, 0.4 < z < 0.9, and a high, 1.2 < z < 3.0, redshift sub-sample and we use Spitzer observations of a z < 0.1 3CRR sample as a local comparison. By comparison to numbers from the Square Kilometre Array (SKA) Simulated Skies, we find that our moderate-redshift sample is complete and our high-redshift sample is 14 per cent complete. We constrain the ranges of mean star formation rates (SFRs) to be 3.4-4.2, 18-41 and 80-581 M-circle dot yr-1 for the local, moderate- and high-redshift samples, respectively. Hence, we observe an increase in the mean SFR with increasing redshift which we can parametrize as similar to(1 + z)Q, where Q = 4.2 +/- 0.8. However, we observe no trends of mean SFR with radio luminosity within the moderate- or high-redshift bins. We estimate that radio-loud active galactic nuclei (AGN) in the high-redshift sample contribute 0.1-0.5 per cent to the total SFR density at that epoch. Hence, if all luminous starbursts host radio-loud AGN we infer a radio-loud phase duty cycle of 0.001-0.005.