General relativistic X ray (UV) polarization rotations as a quantitative test for black holes

Details General relativistic X ray (UV) polarization rotations as a quantitative test for black holes General relativistic X ray (UV) polarization rotations as a quantitative test for black holes

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nascp3046..104s&link_type=abstract

In NASA, Relativistic Gravitational Experiments in Space p 104-109 (SEE N90-19940 12-90)

Astronomy and Astrophysics

Astronomy

Black Holes (Astronomy), Polarization (Waves), Relativity, X Ray Binaries, Active Galactic Nuclei, Galactic Rotation, Polarimetry, Proportional Counters, Quasars, Sensitivity, X Rays

Scientific paper

It is now 11 years since a potentially easily observable and quantitative test for black holes using general relativistic polarization rotations was proposed (Stark and Connors 1977, and Connors and Stark 1977). General relativistic rotations of the x ray polarization plane of 10 to 100 degrees with x ray energy (between 1 and 100 keV) are predicted for black hole x ray binaries. (Classically, by symmetry, there is no rotation.) Unfortunately, x ray polarimetry has not been taken sufficiently seriously during this period, and this test has not yet been performed. A similar (though probably less clean) effect is expected in the UV for supermassive black holes in some quasars active galactic nuclei. Summarizing: (1) a quantitative test (proposed in 1977) for black holes exists; (2) x ray polarimetry of galactic x ray binaries sensitive to at least 1/2 percent between 1 keV and 100 keV is needed (polarimetry in the UV of quasars and AGN will also be of interest); and (3) proportional counters using timerise discrimination were shown in laboratory experiments able to perform x ray polarimetry and this and other methods need to be developed.

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