University of Hertfordshire

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From the same journal

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  • 1811.07931v1

    Accepted author manuscript, 3.32 MB, PDF document

  • 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
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Original languageUndefined/Unknown
JournalAstronomy & Astrophysics
Early online date16 Aug 2018
Publication statusE-pub ahead of print - 16 Aug 2018


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 $\,


16 figures, 3 tables and 19 pages. This paper is part of the LOFAR surveys data release 1 and has been accepted for publication in a special edition of A&A that will appear in Feb 2019, volume 622. The catalogues and images from the data release will be publicly available on upon publication of the journal. Reproduced with permission from Astronomy & Astrophysics. © 2018 ESO


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