University of Hertfordshire

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Documents

  • 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
Journal publication date16 Aug 2018
Early online date16 Aug 2018
DOIs
Publication statusE-pub ahead of print - 16 Aug 2018

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 $\,

Notes

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 lofar-surveys.org upon publication of the journal. Reproduced with permission from Astronomy & Astrophysics. © 2018 ESO

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