The origin of radio emission in broad absorption line quasars: Results from the LOFAR Two-metre Sky Survey

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. and Williams, W. L. (2018) The origin of radio emission in broad absorption line quasars: Results from the LOFAR Two-metre Sky Survey. Astronomy & Astrophysics. ISSN 0004-6361
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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 $\,


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