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A multiwavelength continuum characterization of high-redshift broad absorption line quasars

Abstract: We present the results of a multiwavelength study of a sample of high-redshift radio-loud (RL) broad absorption line (BAL) quasars. This way, we extend to higher redshift previous studies on the radio properties and broad-band optical colours of these objects. We have selected a sample of 22 RL BAL quasars with 3.6 ? z ? 4.8 cross-correlating the FIRST radio survey with the Sloan Digital Sky Survey (SDSS). Flux densities between 1.25 and 9.5 GHz have been collected with the Jansky Very Large Array and Effelsberg-100 m telescopes for 15 BAL and 14 non-BAL quasars used as a comparison sample. We determine the synchrotron peak frequency, constraining their age. A large number of gigahertz peaked spectrum and high-frequency peakers sources have been found in both samples (80 per cent for BAL and 71 per cent for non-BAL quasars), not suggesting a younger age for BAL quasars. The spectral index distribution provides information about the orientation of these sources, and we find statistically similar distributions for the BAL and non-BAL quasars in contrast to work done on lower redshift samples. Our sample may be too small to convincingly find the same effect, or might represent a real evolutionary effect based on the large fraction of young sources. We also study the properties of broad-band colours in both optical (SDSS) and near- and mid-infrared (UK Infrared Telescope Deep Sky Survey and Wide-field Infrared Survey Explorer ?WISE) bands, finding that also at high-redshift BAL quasars tend to be optically redder than non-BAL quasars. However, these differences are no more evident at longer wavelength, when comparing colours of the two samples by mean of the WISE survey.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Tuccillo D., Bruni G., DiPompeo M., Brotherton M., Pasetto A., Kraus A., González-Serrano J., Mack K.,

 Fuente: MNRAS 467, 4763?4776 (2017)

Editorial: Oxford University Press

 Fecha de publicación: 01/06/2017

Nº de páginas: 14

Tipo de publicación: Artículo de Revista

 DOI: 10.1093/mnras/stx333

ISSN: 0035-8711,1365-2966

Proyecto español: AYA2011-29517-C03-02 ; AYA2014-58861-C3-2-P

Url de la publicación: https://doi.org/10.1093/mnras/stx333