Accretion onto Compact Objects: The Frequency-Dependent Hard X-Ray Lags and Extended Non-uniform Coronae

Details Accretion onto Compact Objects: The Frequency-Dependent Hard X-Ray Lags and Extended Non-uniform Coronae Accretion onto Compact Objects: The Frequency-Dependent Hard X-Ray Lags and Extended Non-uniform Coronae

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.4817h&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #48.17; Bulletin of the American Astronomical Society, Vol. 29, p.1291

Astronomy and Astrophysics

Astronomy

Scientific paper

We show that: 1) The Fourier frequency-dependent hard X-ray lag, first discovered from the analysis of aperiodic variability of the light curves of the black hole candidate Cygnus X-1, is a fairly common phenomenon among accreting compact sources. 2) The hard X-ray time lag can be explained in terms of Comptonization process in non-uniform and extended coronae of hot electrons. 3) The density profile of a corona can significantly affect the Comptonization energy spectrum from it. Consequently, fitting the energy spectrum alone is not sufficient to uniquely determine the optical depth and temperature of the Comptonization cloud if its density profile is unknown. 4) The time lag as a function of Fourier frequency for the X-rays in two energy bands is sensitive to the density distribution of the scattering corona. Thus simultaneous analysis of the spectral and temporal X-ray data will allow us to probe the density structure of the Comptonizing corona and thereby the dynamics of mass accretion onto the compact object.

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