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The ATLAS^(3D) Project – XXXI. Nuclear radio emission in nearby early-type galaxies

Nyland, Kristina and Young, Lisa M. and Wrobel, Joan M. and Sarzi, Marc and Morganti, Raffaella and Alatalo, Katherine and Blitz, Leo and Bournaud, Frédéric and Bureau, Martin and Cappellari, Michele and Crocker, Alison F. and Davies, Roger L. and Davis, Timothy A. and de Zeeuw, P. T. and Duc, Pierre-Alain and Emsellem, Eric and Khochfar, Sadegh and Krajnović, Davor and Kuntschner, Harald and McDermid, Richard M. and Naab, Thorsten and Oosterloo, Tom and Scott, Nicholas and Serra, Paolo and Weijmans, Anne-Marie (2016) The ATLAS^(3D) Project – XXXI. Nuclear radio emission in nearby early-type galaxies. Monthly Notices of the Royal Astronomical Society, 458 (2). pp. 2221-2268. ISSN 0035-8711.

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We present the results of a high-resolution, 5 GHz, Karl G. Jansky Very Large Array study of the nuclear radio emission in a representative subset of the ATLAS^(3D) survey of early-type galaxies (ETGs). We find that 51 ± 4 per cent of the ETGs in our sample contain nuclear radio emission with luminosities as low as 10^(18) W Hz^(−1). Most of the nuclear radio sources have compact (≲25–110 pc) morphologies, although ∼10 per cent display multicomponent core+jet or extended jet/lobe structures. Based on the radio continuum properties, as well as optical emission line diagnostics and the nuclear X-ray properties, we conclude that the majority of the central 5 GHz sources detected in the ATLAS^(3D) galaxies are associated with the presence of an active galactic nucleus (AGN). However, even at subarcsecond spatial resolution, the nuclear radio emission in some cases appears to arise from low-level nuclear star formation rather than an AGN, particularly when molecular gas and a young central stellar population is present. This is in contrast to popular assumptions in the literature that the presence of a compact, unresolved, nuclear radio continuum source universally signifies the presence of an AGN. Additionally, we examine the relationships between the 5 GHz luminosity and various galaxy properties including the molecular gas mass and – for the first time – the global kinematic state. We discuss implications for the growth, triggering, and fuelling of radio AGNs, as well as AGN-driven feedback in the continued evolution of nearby ETGs.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Alatalo, Katherine0000-0002-4261-2326
Crocker, Alison F.0000-0001-8513-4945
Additional Information:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 February 17. Received 2016 February 15. In original form 2015 July 3. First published online February 24, 2016. We thank the referee for carefully reading our paper and for providing us with constructive comments that have strengthened it substantially. We also thank Rene Breton for helpful discussions on accurately calculating statistical parameters and for generously providing us with a PYTHON script for calculating the censored Kendall's τ statistic. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research was funded in part by National Science Foundation grant 1109803. The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013) / ERC Advanced Grant RADIOLIFE-320745. MC acknowledges support from a Royal Society University Research Fellowship. This work was supported by the rolling grants ‘Astrophysics at Oxford’ PP/E001114/1 and ST/H002456/1 and visitor grants PPA/V/S/2002/00553, PP/E001564/1, and ST/H504862/1 from the UK Research Councils. RLD acknowledges travel and computer grants from Christ Church, Oxford and support from the Royal Society in the form of a Wolfson Merit Award 502011.K502/jd. TN acknowledges support from the DFG Cluster of Excellence Origin and Structure of the Universe. MS acknowledges support from an STFC Advanced Fellowship ST/F009186/1. TAD acknowledges the support provided by an ESO fellowship. The research leading to these results has received funding from the European Community's Seventh Framework Programme (/FP7/2007-2013/) under grant agreement no. 229517. The authors acknowledge financial support from ESO. SK acknowledges support from the Royal Society Joint Projects Grant JP0869822. NS acknowledges support of Australian Research Council grant DP110103509. AW acknowledges support of a Leverhulme Trust Early Career Fellowship. Facilities: NRAO
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
European Research Council (ERC)RADIOLIFE-320745
Particle Physics and Astronomy Research Council (PPARC)PP/E001114/1
Science and Technology Facilities Council (STFC)ST/H002456/1
Particle Physics and Astronomy Research Council (PPARC)PPA/V/S/2002/00553
Particle Physics and Astronomy Research Council (PPARC)PP/E001564/1
Science and Technology Facilities Council (STFC)ST/H504862/1
Christ Church, OxfordUNSPECIFIED
Royal Society502011.K502/jd
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Science and Technology Facilities Council (STFC)ST/F009186/1
European Southern Observatory (ESO)UNSPECIFIED
European Research Council (ERC)229517
Royal SocietyJP0869822
Australian Research CouncilDP110103509
Leverhulme TrustUNSPECIFIED
Subject Keywords:galaxies: active galaxies: nuclei radio continuum: galaxies
Record Number:CaltechAUTHORS:20160603-091236125
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Official Citation:Kristina Nyland, Lisa M. Young, Joan M. Wrobel, Marc Sarzi, Raffaella Morganti, Katherine Alatalo, Leo Blitz, Frédéric Bournaud, Martin Bureau, Michele Cappellari, Alison F. Crocker, Roger L. Davies, Timothy A. Davis, P. T. de Zeeuw, Pierre-Alain Duc, Eric Emsellem, Sadegh Khochfar, Davor Krajnović, Harald Kuntschner, Richard M. McDermid, Thorsten Naab, Tom Oosterloo, Nicholas Scott, Paolo Serra, and Anne-Marie Weijmans The ATLAS3D Project – XXXI. Nuclear radio emission in nearby early-type galaxies MNRAS (May 11, 2016) Vol. 458 2221-2268 doi:10.1093/mnras/stw391 first published online February 24, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67642
Deposited By: Ruth Sustaita
Deposited On:03 Jun 2016 17:47
Last Modified:17 Aug 2017 03:00

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