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How does the radio enhancement of broad absorption line quasars relate to colour and accretion rate?

Petley, James W; Morabito, Leah K; Rankine, Amy L; Richards, Gordon T; Thomas, Nicole L; Alexander, David M; Fawcett, Victoria A; Calistro Rivera, Gabriela; Prandoni, Isabella; Best, Philip N; Kolwa, Sthabile

How does the radio enhancement of broad absorption line quasars relate to colour and accretion rate? Thumbnail


Authors

James Petley james.w.petley@durham.ac.uk
PGR Student Doctor of Philosophy

Amy L Rankine

Gordon T Richards

Victoria A Fawcett

Gabriela Calistro Rivera

Isabella Prandoni

Philip N Best



Abstract

The origin of radio emission in different populations of radio-quiet quasars is relatively unknown, but recent work has uncovered various drivers of increased radio-detection fraction. In this work, we pull together three known factors: optical colour (g - i), C IV distance (a proxy for L/LEdd), and whether or not the quasar contains broad absorption lines (BALQSOs) which signify an outflow. We use SDSS (Sloan Digital Sky Survey) DR14 spectra along with the LOFAR Two Metre Sky Survey Data Release 2 and find that each of these properties have an independent effect. BALQSOs are marginally more likely to be radio-detected than non-BALQSOs at similar colours and L/LEdd, moderate reddening significantly increases the radio-detection fraction and the radio detection increases with L/LEdd above a threshold for all populations. We test a widely used simple model for radio wind shock emission and calculate energetic efficiencies that would be required to reproduce the observed radio properties. We discuss interpretations of these results concerning radio-quiet quasars more generally. We suggest that radio emission in BALQSOs is connected to a different physical origin than the general quasar population since they show different radio properties independent of colour and C IV distance.

Citation

Petley, J. W., Morabito, L. K., Rankine, A. L., Richards, G. T., Thomas, N. L., Alexander, D. M., …Kolwa, S. (2024). How does the radio enhancement of broad absorption line quasars relate to colour and accretion rate?. Monthly Notices of the Royal Astronomical Society, 529(3), 1995-2007. https://doi.org/10.1093/mnras/stae626

Journal Article Type Article
Acceptance Date Feb 28, 2024
Online Publication Date Feb 29, 2024
Publication Date 2024-04
Deposit Date Mar 27, 2024
Publicly Available Date Mar 27, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 529
Issue 3
Pages 1995-2007
DOI https://doi.org/10.1093/mnras/stae626
Keywords Space and Planetary Science; Astronomy and Astrophysics
Public URL https://durham-repository.worktribe.com/output/2348688

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