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No evidence for quenching in quasars

Published online by Cambridge University Press:  29 March 2021

Clare Wethers Open the ORCID record for Clare Wethers [Opens in a new window] ,
Nischal Acharya ,
Roberto De Propris ,
Jari Kotilainen ,
Malte Schramm  and
Andreas Schulze
Clare Wethers
Affiliation:
Finnish Centre for Astronomy with ESO (FINCA), Vesilinnantie 5, FI-20014 University of Turku, Finland email: clare.wethers@utu.fi
Nischal Acharya
Affiliation:
Finnish Centre for Astronomy with ESO (FINCA), Vesilinnantie 5, FI-20014 University of Turku, Finland email: clare.wethers@utu.fi
Roberto De Propris
Affiliation:
Finnish Centre for Astronomy with ESO (FINCA), Vesilinnantie 5, FI-20014 University of Turku, Finland email: clare.wethers@utu.fi
Jari Kotilainen
Affiliation:
Finnish Centre for Astronomy with ESO (FINCA), Vesilinnantie 5, FI-20014 University of Turku, Finland email: clare.wethers@utu.fi Department of Physics and Astronomy, Vesilinnantie 5, FI-20014 University of Turku, Finland
Malte Schramm
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Andreas Schulze
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
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Abstract

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The role of quasar feedback in galaxy evolution remains poorly understood. Throughout this work, we explore the effects of negative feedback on star formation in quasar host galaxies, analysing two distinct populations of quasars. The first is a sample of high-redshift (z > 2) low-ionisation broad absorption line quasars (LoBALs) - a class of quasars hosting energetic mass outflows, in which we find evidence for prolific star formation (>750Mʘyr–1) exceeding that of non-BAL quasars at the same redshift. The second is a population of 207 low-redshift (z < 0.3) quasars, in which we find an enhancement in the SFRs of quasar hosts compared to the underlying galaxy population, with no quasars residing in quiescent hosts over the last 2Gyr. Overall, we find no evidence for galaxy-wide quenching in either population, rather we suggest that the dominant effect of quasar activity is to enhance star formation in the galaxy.

Keywords

quasars: generalgalaxies: generalgalaxies: evolutiongalaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 82 - 88
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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