The polarization properties of Broad Absorption Line QSOs : observational results
نویسنده
چکیده
Correlations between BAL QSO intrinsic properties and polarization have been searched for. Some results are summarized here, providing possible constraints on BAL outflow models.
منابع مشابه
Polarization properties of a sample of broad absorption line and gravitationally lensed quasars
New broad-band linear polarization measurements have been obtained for a sample of 42 optically selected QSOs including 29 broad absorption line (BAL) QSOs. The polarization properties of different sub-classes have been compared, and possible correlations with various spectral indices searched for. The main results of our study are: (1) Nearly all highly polarized QSOs of our sample belong to t...
متن کاملPolarization of Quasars: Electronic Scattering in the Broad Absorption Line Region
It is widely accepted that the broad absoption line region (BALR) exists in most (if not all) quasars with a small covering factor. Recent works showed that the BALR is optically thick to soft and even medium energy X-rays, with a typical hydrogen column density of a few 10 to > 10 cm. The electronic scattering in the thick absorber might contribute significantly to the observed continuum polar...
متن کاملPolarization of Quasars: Resonant Line Scattering in the Broad Absorption Line Region
Recent works showed that the absorbing material in broad absorption line (BAL) quasars is optically thick to major resonant absorption lines. This material may contribute significantly to the polarization in the absorption lines. In this paper, we present a detailed study of the resonant line scattering process using Monte-Carlo method to constrain the optical depth, the geometry and the kinema...
متن کاملPolarization properties of broad absorption line QSOs : new statistical clues
We report the results of several statistical tests performed on a large sample of 139 broad absorption line (BAL) QSOs with good quality optical spectra and/or optical polarization data. Correlations between ten optical indices and the polarization degree p0 are systematically searched for. We find six significant non-trivial correlations. In order to identify the most important correlations, w...
متن کاملThe optical polarization of radio-loud and radio-intermediate broad absorption line quasi-stellar objects
On the basis of a sample of approximately 50 broad absorption line quasi-stellar objects (BAL QSOs), we investigate possible correlations between BAL QSO radio properties and other spectral characteristics, including polarization. For this purpose new polarization data have been obtained. The main result of our statistical study is the absence of significant correlations between the radio-to-op...
متن کامل