Spectropolarimetry of Radio-Selected Broad Absorption Line Quasars

Details Spectropolarimetry of Radio-Selected Broad Absorption Line Quasars Spectropolarimetry of Radio-Selected Broad Absorption Line Quasars

2010-06-30

arxiv.org/abs/1007.0028v1

Astrophysical Journal Supplement Series, 189:83-103, 2010 July

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Scientific paper

We report spectropolarimetry of 30 radio-selected broad absorption line (BAL) quasars with the Keck Observatory, 25 from the sample of Becker et al. (2000). Both high and low-ionization BAL quasars are represented, with redshifts ranging from 0.5 to 2.5. The spectropolarimetric properties of radio-selected BAL quasars are very similar to those of radio-quiet BAL quasars: a sizeable fraction (20%) show large continuum polarization (2-10%) usually rising toward short wavelengths, emission lines are typically less polarized than the continuum, and absorption line troughs often show large polarization jumps. There are no significant correlations between polarization properties and radio properties, including those indicative of system orientation, suggesting that BAL quasars are not simply normal quasars seen from an edge-on perspective.

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