ON THE X-RAY OUTBURSTS OF TRANSIENT ANOMALOUS X-RAY PULSARS AND SOFT GAMMA-RAY REPEATERS

As the outburst continues and the X-ray flux increases, the GBHT usually transitions to a soft state (SS) in which the X-ray spectrum is now dominated by the optically thick

The power-law index Γ of the hard X-ray spectrum depends mainly on the accretion rate, or equivalently on the transverse optical depth of the accretion column at the radiative

Our inves- tigations confirmed the known positive correlation between photon index and centroid frequency of the QPOs and revealed an anticor- relation between the fraction

The large effective area and the spectral capabilities of LOFT will make optimal use of the diagnostic potential of the fast variability of the X-ray emission to probe the behaviour

The effect of the instability on the light curves are different for transient and persistent sources due to different pre-burst disk conditions in these systems.. Keywords:

We test the hypothesis that the power-law, hard X-ray spectra are produced in the accretion flow mainly by bulk-motion Comptonization of soft photons emitted at the neutron

Most theoretical models of accreting X-ray pulsars predict that the linear polarization of this X radiation is high and varies with pulse phase (due to rotation) and with energy

The time evolution of the mass accretion rate ˙ M onto the neutron star, which is observed as the X-ray light curve, is similar for all differ- ent models of the disk.. For a