The Polarized Spectrum of the BALQSO PG 1700+518

Details The Polarized Spectrum of the BALQSO PG 1700+518 The Polarized Spectrum of the BALQSO PG 1700+518

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.8409h&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #84.09; Bulletin of the American Astronomical Society, Vol. 27, p.1410

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present optical broad-band polarimetry and spectropolarimetry of the low redshift Broad Absorption Line (BAL) QSO PG 1700+518. The average observed optical polarization is low ( ~ 1%), but features associated with the emission lines are clearly present in the percentage polarization and position angle spectra. While not obviously present in total flux, broad absorption from Hβ , and probably from Hα , is detected in the polarized flux spectrum. The Hβ absorption starts at the emission line peak and extends to shorter wavelengths by ~ 5600 km s(-1) . This is in contrast to the detached and quite broad (>= 10,000 km s(-1) ) MgII lambda 2798 and CIV lambda 1549 absorption lines seen in the UV total flux spectrum (Turnshek et al. 1985, ApJ, 294, L1; Pettini & Boksenberg 1985, ApJ, 294, L73) We Discuss the possible polarization mechanisms, and the implications of these results for the structure of BALQSOs.

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