Characteristic Frequencies in Black-Hole X-Ray Variability: mHz to kHz

Details Characteristic Frequencies in Black-Hole X-Ray Variability: mHz to kHz Characteristic Frequencies in Black-Hole X-Ray Variability: mHz to kHz

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.p3001v&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

The X-ray emission of black-hole candidates accreting matter from a stellar companion in binary star systems in our Galaxy shows variability on a wide range of time scales. This variability is used to diagnose the flow of matter into the black hole and can potentially be used to probe spacetime geometry down to quite near the hole. I review this black-hole variability and compare it to that of neutron stars in similar systems. Characteristic frequencies which can be distinguished include centroid frequencies and coherencies of quasi-periodic variability components (QPOs), and cut-off frequencies of band-limited noise components. Some of these may be related to time scales associated with general-relativistic orbital motion closely around the hole; I will present recent evidence for variability on time scales as short as a millisecond. The variability phenomenology of black hole candidates is closely related to that of low-magnetic field neutron stars, to the extent that these are sometimes hard to distinguish. This provides clues to possible models (two different natural experiments to compare) as well as constraining them (presence of a horizon, or of a non-spin-aligned magnetic field, can not be essential for any phenomenon seen in both black holes and neutron stars).

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