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Accretion and star formation in ‘radio-quiet’ quasars

Published online by Cambridge University Press:  29 January 2021

Sarah V. White ,
Matt J. Jarvis ,
Eleni Kalfountzou ,
Martin J. Hardcastle ,
Aprajita Verma ,
José M. Cao Orjales  and
Jason Stevens
Sarah V. White
Affiliation:
South African Radio Astronomy Observatory (SARAO), 2 Fir Street, Observatory, Cape Town, 7925, South Africa Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown, 6140, South Africa Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, UK email: sarahwhite.astro@gmail.com
Matt J. Jarvis
Affiliation:
Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, UK email: sarahwhite.astro@gmail.com Department of Physics, University of the Western Cape, Bellville 7535, South Africa
Eleni Kalfountzou
Affiliation:
European Space Astronomy Centre (ESAC), Villanueva de la Cañada, E-28692 Madrid, Spain Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield, Herts, AL10 9AB, UK
Martin J. Hardcastle
Affiliation:
Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield, Herts, AL10 9AB, UK
Aprajita Verma
Affiliation:
Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, UK email: sarahwhite.astro@gmail.com
José M. Cao Orjales
Affiliation:
Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield, Herts, AL10 9AB, UK
Jason Stevens
Affiliation:
Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield, Herts, AL10 9AB, UK
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Abstract

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Radio observations allow us to identify a wide range of active galactic nuclei (AGN), which play a significant role in the evolution of galaxies. Amongst AGN at low radio-luminosities is the ‘radio-quiet’ quasar (RQQ) population, but how they contribute to the total radio emission is under debate, with previous studies arguing that it is predominantly through star formation. In this talk, SVW summarised the results of recent papers on RQQs, including the use of far-infrared data to disentangle the radio emission from the AGN and that from star formation. This provides evidence that black-hole accretion, instead, dominates the radio emission in RQQs. In addition, we find that this accretion-related emission is correlated with the optical luminosity of the quasar, whilst a weaker luminosity-dependence is evident for the radio emission connected with star formation. What remains unclear is the process by which this accretion-related emission is produced. Understanding this for RQQs will then allow us to investigate how this type of AGN influences its surroundings. Such studies have important implications for modelling AGN feedback, and for determining the accretion and star-formation histories of the Universe.

Keywords

galaxies: activegalaxies: statisticsgalaxies: evolutiongalaxies: high-redshiftquasars: generalradio continuum: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 204 - 208
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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