Bibcode
Montenegro-Montes, F. M.; Mack, K.-H.; Benn, C. R.; Carballo, R.; González-Serrano, J. I.; Holt, J.; Jiménez-Luján, F.
Referencia bibliográfica
Astronomische Nachrichten, Vol.330, Issue 2, p.157
Fecha de publicación:
2
2009
Número de citas
9
Número de citas referidas
7
Descripción
Studying Broad Absorption Line Quasars (BAL QSOs) is interesting because
they probe the physics of the AGN environment, and because AGN outflows
are important ingredients in many recent astrophysical puzzles. In the
last decade, a substantial population of radio BAL QSOs was discovered
and we have started a characterisation of the radio-loud BAL QSO
population studying their radio spectra, radio morphology and
polarisation properties. Our high-resolution radio maps show that BAL
QSOs are compact radio sources with projected linear sizes below 1 kpc.
Most BAL QSOs in our sample are unpolarised or weakly polarised at 8.4
GHz. They display convex radio spectra which typically flatten at low
frequencies and become steeper at high frequencies, i.e. above 20 GHz.
Many of these characteristics are common to the population of young
radio sources, like Compact Steep Spectrum (CSS) or Gigahertz-Peaked
Spectrum (GPS) sources. The above supports the hypothesis that BAL QSOs
might be related to the initial stages in the AGN evolution.