GRS 1915+105: the distance, radiative processes and energy‐dependent variability

摘要: We present an exhaustive analysis of five broad-band observations GRS 1915+105 in two variability states, / and w, observed simultaneously by the Proportional Counter Array (PCA) High-Energy X-ray Timing Experiment (HEXTE) detectors aboard Rossi Explorer, Oriented Scintillation Spectrometer (OSSE) detector Compton Gamma-ray Observatory. find all spectra well fitted Comptonization disc blackbody photons, with very strong evidence for presence a non-thermal electron component Comptonizing plasma. Both energy power X state are typical high/intermediate black hole binaries. The spectrum ω is characterized Comptonized thermal electrons weak tail. then calculate rms (fractional as functions energy) PCA data. accurately model coherent superposition components implied spectral fits, namely less variable more Comptonization. latter dominates at high energies, resulting flattening energies most This also case quasi-periodic oscillations state. Then, some our data require radial dependence blackbody. study distance to source, d ≃ 11 kpc likely value, contrary recent claim much lower value.