Far-infrared emission in luminous quasars accompanied by nuclear outflows

Maddox, Natasha and Jarvis, M.J. and Banerji, M. and Hewett, P.C. and Bourne, N. and Dunne, L. and Dye, S. and Eales, S. and Furlanetto, C. and Maddox, S.J. and Smith, M.W.L. and Valiante, E. (2017) Far-infrared emission in luminous quasars accompanied by nuclear outflows. Monthly Notices of the Royal Astronomical Society, 470 (2). pp. 2314-2319. ISSN 1365-2966

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Abstract

Combining large-area optical quasar surveys with the new far-infrared (FIR) Herschel-ATLAS Data Release 1, we search for an observational signature associated with the minority of quasars possessing bright FIR luminosities. We find that FIR-bright quasars show broad C IV emission-line blueshifts in excess of that expected from the optical luminosity alone, indicating particularly powerful nuclear outflows. The quasars show no signs of having redder optical colours than the general ensemble of optically selected quasars, ruling out differences in line-of-sight dust within the host galaxies. We postulate that these objects may be caught in a special evolutionary phase, with unobscured, high black hole accretion rates and correspondingly strong nuclear outflows. The high FIR emission found in these objects is then either a result of star formation related to the outflow, or is due to dust within the host galaxy illuminated by the quasar. We are thus directly witnessing coincident small-scale nuclear processes and galaxy-wide activity, commonly invoked in galaxy simulations that rely on feedback from quasars to influence galaxy evolution.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: surveys – galaxies: evolution – quasars: general – galaxies: star formation – infrared: galaxies
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1093/mnras/stx1416
Depositing User: Hatton, Mrs Kirsty
Date Deposited: 25 Aug 2017 09:46
Last Modified: 18 Oct 2017 18:40
URI: http://eprints.nottingham.ac.uk/id/eprint/45139

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