Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.266..429s&link_type=abstract
Nature, vol. 266, Mar. 31, 1977, p. 429, 430.
Astronomy and Astrophysics
Astronomy
44
Black Holes (Astronomy), Polarization Characteristics, Relativistic Effects, Stellar Rotation, X Ray Sources, Angular Momentum, Astronomical Models, Energy Spectra, Gravitational Effects, Spaceborne Astronomy, Spectral Energy Distribution, Stellar Mass Accretion
Scientific paper
Preliminary results of a full general-relativistic calculation of the polarization properties of radiation from an X-ray source containing a rotating black hole are presented which demonstrate that gravitational effects completely alter the polarization properties of the radiation with respect to predictions based on a Newtonian approximation. Specifically, numerical results are reported for a corotating equatorial-disk model of a Kerr black hole having specific angular momentum of 0.9981. The calculations show that general-relativistic effects cause a large rotation of the polarization plane with energy and produce fluctuations in the degree of polarization due to gravitational bending of the X-rays. It is concluded that the very large general-relativistic rotations in the plane of polarization provide an opportunity for testing the black-hole hypothesis on the nature of Cygnus X-1.
Connors P. A.
Stark Richard F.
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