Broad redshifted line as a signature of outflow

Details Broad redshifted line as a signature of outflow Broad redshifted line as a signature of outflow

2003-07-28

arxiv.org/abs/astro-ph/0307486v1

Astrophys.J.598:411-418,2003

Astronomy and Astrophysics

Astrophysics

16 pages, 1 black-white figure and 2 color figures; accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/378701

We formulate and solve the diffusion problem of line photon propagation in a bulk outflow from a compact object (black hole or neutron star) using a generic assumption regarding the distribution of line photons within the outflow. Thomson scattering of the line photons within the expanding flow leads to a decrease of their energy which is of first order in v/c, where v is the outflow velocity and c is the speed of light. We demonstrate that the emergent line profile is closely related to the time distribution of photons diffusing through the flow (the light curve) and consists of a broad redshifted feature. We analyzed the line profiles for the general case of outflow density distribution. We emphasize that the redshifted lines are intrinsic properties of the powerful outflow that are supposed to be in many compact objects.

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