Journal Article

Profiles of spectral lines from failed and decelerated winds from neutron stars and black holes

A. V. Dorodnitsyn

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 2, pages 1060-1070
Published in print August 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16728.x
Profiles of spectral lines from failed and decelerated winds from neutron stars and black holes

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We calculate profiles of spectral lines from an extended outflow from the compact object (a black hole or a neutron star). We assume that the bulk velocity of the flow increases during a short phase of acceleration and then rapidly decreases forming a failed wind. We also study the wind which is only decelerating. We show that depending on the relative strength of the gravitational redshifting line profiles from such winds may be of several types: distorted P-Cygni (emission and blueshifted absorption); W-shaped (absorption–emission–absorption) and inverted P-Cygni (emission–redshifted absorption). The latter case is expected from accretion flows where the velocity is directed inwards; however, we show that inverted P-Cygni profile can be produced by the failed wind, provided the line is formed within several tens of Schwarzschild radii from the compact object.

Keywords: line: formation; radiation mechanisms: general; radiative transfer; stars: mass-loss; stars: winds, outflows; galaxies: active

Journal Article.  7204 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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