Santoro, F. orcid.org/0000-0002-6363-9851, Rose, M., Morganti, R. et al. (3 more authors) (2018) Probing multi-phase outflows and AGN feedback in compact radio galaxies: the case of PKSB 1934-63. Astronomy & Astrophysics, 617. A139. ISSN 0004-6361
Abstract
Young radio AGN are pivotal for our understanding of many of the still-debated aspects of AGN feedback. In this paper we present a study of the interstellar medium (ISM) in the compact, peaked-spectrum radio galaxy PKS B1934-63 using X-shooter observations. Most of the warm ionized gas resides within a circum-nuclear disk with a radius of about 200 pc that is likely to constitute the gas reservoir from which the central black hole feeds. On the other hand, we find a biconical outflow of warm ionized gas with an estimated radius of 59±12 pc. This matches the radial extent of the radio source and suggests that the outflow is jet driven. Thanks to the superior wavelength coverage of the data, we can estimate the density of the warm ionized gas using the trans-auroral line technique, and we find that the outflowing gas has remarkably high density, up to logne (cm−3) ' 5.5. The estimated mass outflow rate is low ( ˙ M =10−3-10−1 Mo yr−1), and the AGN feedback operates at relatively low efficiency ( ˙ E/Lbol ∼10−4-10−3%). In addition,optical and near-IR line ratios show that the expansion of the radio source drives fast shocks (with velocities vs & 500 kms−1) that ionize and accelerate the outflowing gas. Atoddswiththepropertiesofothercompact,peaked-spectrumradiosourceshostingwarmionizedgasoutflows,wedonotfindsigns ofkinematicallydisturbedoroutflowinggasinphasescolderthanthewarmionizedgas.Wearguethatthisisduetotheyoungageof our source and thus to the recent nature of the AGN-ISM interaction, and suggest that cold gas forms within the outflowing material and the shock-ionized outflowing gas of PKS B1934-63 did not have enough time to cool down and accumulate in a colder phase. This scenario is also supported by the multi-phase outflows of other compact and young radio sources in the literature.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2018 EDP Sciences. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Galaxies: active; evolution; ISM - ISM: jets and outflows; evolution; Galaxies: individual: PKS B1934-63 |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number Science and Technology Facilities Council ST/M001350/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 03 Jul 2018 14:17 |
Last Modified: | 03 Aug 2020 12:51 |
Status: | Published |
Publisher: | EDP Sciences |
Refereed: | Yes |
Identification Number: | 10.1051/0004-6361/201833248 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:132785 |