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

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

J. W Petley, L. K Morabito, A. L Rankine, G. T Richards, N. L Thomas, D. M Alexander, V. A Fawcett, G. Calistro Rivera, I Prandoni, P. N Best, …
arXiv.org
28 Feb 2024
DOI: https://doi.org/10.48550/arxiv.2402.18623
url
https://doi.org/10.48550/arxiv.2402.18623View
Preprint (Author's original)arXiv.org - Non-exclusive license to distribute,  Open

Abstract

Physics - Astrophysics of Galaxies Physics - High Energy Astrophysical Phenomena
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 ($g-i$), \CIV Distance (a proxy for $L/L_{Edd}$) and whether or not the quasar contains broad absorption lines (BALQSOs) which signify an outflow. We use SDSS 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 $L/L_{Edd}$, moderate reddening significantly increases the radio-detection fraction and the radio-detection increases with $L/L_{Edd}$ 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 \CIV distance.

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