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Session 53 - Gamma Ray Investigations.
Oral session, Thursday, June 12
North Main Hall F/G,
We have found relations between the temporal and spectral properties of radiation Comptonized in an extended atmosphere associated with compact accreting sources. We demonstrate that the fluctuation power spectrum density (PSD) imposes constraints on the atmosphere scale and profile. We indicate that the slope and low frequency break of the PSD are related to the Thomson depth \tau_0 of the atmosphere and the radius of its physical size respectively. Since the energy spectrum of the escaping radiation depends also on \tau_0 (and the electron temperature kT_e), the relation between spectral and temporal properties follows. This relation allows for the first time an independent estimate of the accreting matter Thomson depth \tau_0. We present figures for the light curves and PSD of different energy bands, the photon energy spectra and the phase lags as functions of the variability frequency. The temporal properties of the high (soft) and low (hard) state of black hole sources are discussed in this context.
