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

doi:10.1093/mnras/stae626

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

Journal Article · 28 February 2024 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stae626 · OSTI ID:2324668

;

; Best, Philip N.;

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.

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Sponsoring Organization:: USDOE

OSTI ID:: 2324668

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 529; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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