20 papers · 1 filter
A new Comptonization model for low-magnetized accreting neutron stars in low mass X-ray binaries
R. Farinelli, L. Titarchuk, A. Paizis +1
We developed a new model for the X-ray spectral fitting \xspec package which takes into account the effects of both thermal and dynamical (i.e. bulk) Comptonization. The model cons…
On the nature of the variability power decay towards soft spectral states in X-ray binaries. Case study in Cyg X-1
Lev Titarchuk, Nikolai Shaposhnikov
A characteristic feature of the Fourier Power Density Spectrum (PDS) observed from black hole X-ray binaries in low/hard and intermediate spectral states is a broad band-limited no…
Science with the new generation high energy gamma- ray experiments
M. Alvarez, D. D'Armiento, G. Agnetta +197
This Conference is the fifth of a series of Workshops on High Energy Gamma- ray Experiments, following the Conferences held in Perugia 2003, Bari 2004, Cividale del Friuli 2005, El…
Correlations between X-ray Spectral and Timing Characteristics in Cyg X-2
Lev Titarchuk, Sergey Kuznetsov, Nikolai Shaposhnikov
Correlations between the quasi-periodic oscillations (QPOs) and the spectral power-law index have been reported for a number of black hole candidate sources and for four neutron st…
Effects of Downscattering on the Continuum and Line Spectra in Powerful Wind Environment. Monte Carlo Simulations, Analytical Results and Data Analysis
Philippe Laurent, Lev Titarchuk
In Paper by Titarchuk & Shrader the general formulation and results for photon reprocessing (downscattering) that included recoil and Comptonization effects due to divergence of th…
Average hard X-ray emission from NS LMXBs: Observational evidence of different spectral states in NS LMXBs
A. Paizis, R. Farinelli, L. Titarchuk +9
We studied and compared the long-term average hard X-ray (>20keV) spectra of a sample of twelve bright low-mass X-ray binaries hosting a neutron star (NS). Our sample comprises the…