Preprint Logo P48 March

To be published in:
Astronomy & Astrophysics Letters

Spectropolarimetry of the iron low ionization broad absorption line quasar Q0059-2735+

H. Lamy1 and D. Hutsemékers2,1,*

1 Institut d'Astrophysique et de Géophysique - Université de Liège, Avenue de Cointe 5, 4000 Liège, Belgium
2 European Southern Observatory, Casilla 19001, Santiago, CHile

* Chercheur Qualifié FNRS, Belgium

+ Based on observations collected at the European Southern Observatory (ESO, La Silla)


     We present optical (ultraviolet rest-frame) spectropolarimetric observations of the rare iron low ionization broad absorption line (BAL) QSO Q0059-2735. The continuum polarization increases to the blue with a regular rotation of the polarization position angle, suggesting that at least two mechanisms are at the origin of the polarization. There is also some evidence for dilution by a FeIIII blends in absorption are not more polarized than the continuum, while they are clearly visible in the polarized flux. These different polarization properties of FeII absorption lines suggest a different origin and/or geometry. The observed properties of Q0059-2735 are consistent with a hybrid QSO / starburst model.

Key Words
Quasars: absorption lines -- Quasars: individual: Q0059-2735 -- Polarization

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