Probing the precession of the inner accretion disk in Cygnus X-1

Details Probing the precession of the inner accretion disk in Cygnus X-1 Probing the precession of the inner accretion disk in Cygnus X-1

2005-03-08

arxiv.org/abs/astro-ph/0503186v1

Astrophys.J. 626 (2005) 1015-1019

Astronomy and Astrophysics

Astrophysics

To appear in The Astrophysics Journal

Scientific paper

10.1086/430125

We show that changes in the orientation of the inner accretion disk of Cygnus X-1 affect the shape of the broad Fe K$\alpha$ emission line emitted from this object, in such a way that eV-level spectral resolution observations (such as those that will be carried out by the {\it ASTRO-E2} satellite) can be used to analyze the dynamics of the disk. We here present a potential diagnostic tool, supported by numerical simulations, by which a few observations of Cygnus X-1, separated in time, can determine whether its accretion disk actually precesses, and if so, determine its period and precession angle. This approach could also be used for similar studies in other microquasar systems.

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