A polar+equatorial wind model for broad absorption line quasars: I. Fitting the C IV BAL profiles

Abstract

Despite all the studies, the geometry of the wind at the origin of the blueshifted broad absorption lines (BAL) observed in nearly 20% of quasars still remains a matter of debate. We want to see if a two-component polar+equatorial wind geometry can reproduce the typical BAL profiles observed in these objects. We built a Monte Carlo radiative transfer code (called MCRT) to simulate the line profiles formed in a polar+equatorial wind in which the photons, emitted from a spherically symmetric core are resonantly scattered. Our goal is to reproduce typical C IV line profiles observed in BAL quasars and to identify the parameters governing the line profiles. The two-component wind model appears to be efficient in reproducing the BAL profiles from the P Cygni-type profiles to the more complex ones. Some profiles can also be reproduced with a pole-on view. Our simulations provide evidence of a high-velocity rotation of the wind around the polar axis in BAL quasars with non P Cygni-type line profiles.

12 pages, 5 figures, accepted for publication in A&A

References in corpus (5)

• The Intrinsic Fraction of Broad Absorption Line Quasars
• On the Fraction of Quasars with Outflows
• The Physical Nature of Polar Broad Absorption Line Quasars
• Radio Through X-ray Spectral Energy Distributions of 38 Broad Absorption Line Quasars
• Spectropolarimetry of PKS 0040-005 and the Orientation of Broad Absorption Line Quasars

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