The origin of radio emission in broad absorption line quasars: Results from the LOFAR Two-metre Sky Survey
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Author
Morabito, L. K.
Matthews, J. H.
Best, P. N.
Gürkan, G.
Jarvis, M. J.
Prandoni, I.
Duncan, K. J.
Hardcastle, M. J.
Kunert-Bajraszewska, M.
Mechev, A. P.
Mooney, S.
Sabater, J.
Röttgering, H. J. A.
Shimwell, T. W.
Smith, D. J. B.
Tasse, C.
Williams, W. L.
Attention
2299/20990
Abstract
We present a study of the low-frequency radio properties of broad absorption line quasars (BALQSOs) from the LOFAR Two-metre Sky-Survey Data Release 1 (LDR1). The value-added LDR1 catalogue contains Pan-STARRS counterparts, which we match with the Sloan Digital Sky Survey (SDSS) DR7 and DR12 quasar catalogues. We find that BALQSOs are twice as likely to be detected at 144$\,$MHz than their non-BAL counterparts, and BALQSOs with low-ionisation species present in their spectra are three times more likely to be detected than those with only high-ionisation species. The BALQSO fraction at 144$\,$MHz is constant with increasing radio luminosity, which is inconsistent with previous results at 1.4$\,$GHz, indicating that observations at the different frequencies may be tracing different sources of radio emission. We cross-match radio sources between the Faint Images of the Radio Sky at Twenty Centimeters (FIRST) survey and LDR1, which provides a bridge via the LDR1 Pan-STARRS counterparts to identify BALQSOs in SDSS. Consequently we expand the sample of BALQSOs detected in FIRST by a factor of three. The LDR1-detected BALQSOs in our sample are almost exclusively radio-quiet (\logr $\,