Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..569k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 3, p. 569-575.
Astronomy and Astrophysics
Astronomy
71
Accretion Disks, Active Galactic Nuclei, Astronomical Models, Black Holes (Astronomy), Imaging Techniques, Light Curve, Radiative Transfer, Relativity
Scientific paper
We describe a numerical code which has been developed to calculate images of various effects occurring in the close vicinity of a rotating (Kerr) black hole, as seen by a distant observer. Null geodesics are first integrated numerically, fitted by Chebyshev polynomials, and their shape stored in the computer. In this way, for a given set of parameters describing the configuration of the black hole and position of the observer, we obtain a 'catalogue' of photon paths which is then used by subsequent codes adapted to specific problems. Several astrophysically meaningful examples are given, in particular photometric light curves of a bright spot located on the surface of an accretion disk and orbiting the black hole. This approach enables us to speed up appropriate application codes by approximately two orders of magnitude.
Karas Vladimir
Polnarev Alexander G.
Vokrouhlicky David
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