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Prevalence of radio jets associated with galactic outflows and feedback from quasars.

Jarvis, M E and Harrison, C M and Thomson, A P and Circosta, C and Mainieri, V and Alexander, D M and Edge, A C and Lansbury, G B and Molyneux, S J and Mullaney, J R (2019) 'Prevalence of radio jets associated with galactic outflows and feedback from quasars.', Monthly notices of the Royal Astronomical Society., 485 (2). pp. 2710-2730.


We present 1–7 GHz high-resolution radio imaging (VLA and e-MERLIN) and spatially resolved ionized gas kinematics for 10 z < 0.2 type 2 ‘obscured’ quasars (log [LAGN/erg s−1] 45) with moderate radio luminosities (log[L1.4 GHz/W Hz−1] = 23.3–24.4). These targets were selected to have known ionized outflows based on broad [O III] emission-line components (full width at half-maximum≈800–1800 km s−1). Although ‘radio-quiet’ and not ‘radioAGN’ by many traditional criteria, we show that for nine of the targets, star formation likely accounts for 10 per cent of the radio emission. We find that ∼80–90 per cent of these nine targets exhibit extended radio structures on 1–25 kpc scales. The quasars’ radiomorphologies, spectral indices, and position on the radio size–luminosity relationship reveals that these sources are consistent with being low power compact radio galaxies. Therefore, we favour radio jets as dominating the radio emission in the majority of these quasars. The radio jets we observe are associated with morphologically and kinematically distinct features in the ionized gas, such as increased turbulence and outflowing bubbles, revealing jet–gas interaction on galactic scales. Importantly, such conclusions could not have been drawn from current low-resolution radio surveys such as FIRST. Our observations support a scenario where compact radio jets, with modest radio luminosities, are a crucial feedback mechanism for massive galaxies during a quasar phase.

Item Type:Article
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:No date available
Date deposited:27 June 2019
Date of first online publication:25 January 2019
Date first made open access:27 June 2019

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