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

L. K. Morabito, J. H. Matthews, P. N. Best, G. Gürkan, M. J. Jarvis, I. Prandoni, K. J. Duncan, M. J. Hardcastle, M. Kunert-Bajraszewska, A. P. Mechev, S. Mooney, J. Sabater, H. J. A. Röttgering, T. W. Shimwell, D. J. B. Smith, C. Tasse, W. L. Williams

Research output: Contribution to journalArticlepeer-review

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 $\,
Original languageEnglish
Number of pages19
JournalAstronomy & Astrophysics
DOIs
Publication statusPublished - 1 Feb 2019

Keywords

  • astro-ph.GA

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