Keck Spectropolarimetry of Radio-Selected Broad Absorption Line Quasars

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

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560208d&link_type=abstract

American Astronomical Society, AAS Meeting #215, #602.08; Bulletin of the American Astronomical Society, Vol. 36, p.1122

Astronomy and Astrophysics

Astronomy

Scientific paper

We have conducted a spectropolarimetric survey 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 show large continuum polarization (up to 10 percent) 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 indicative of system orientation, challenging the notion that BAL quasars are simply normal quasars seen from an edge-on perspective. This project represents the first part of a larger study testing the orientation-dependent picture of BAL outflows and developing competing evolutionary ideas based on multi-wavelength investigations.
We acknowledge support from NASA through grant #NNG05GE84G and the Wyoming NASA Space Grant Consortium, NASA Grant #NNG05G165H.

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