Speaker
Mr
Mohammed Hasan Soleiman Yussef
(Cairo University, Faculty of Science, Physics department.)
Description
In the present study, we inspecte a refined sample of 117 bursts from SGR1900+14 observed with RXTE, PCA. We use 10 spectral-models, and the best fitting spectral-models has been found statistically to be the thermal bremsstrahlung and the power-law. Data are analyzed more by model-independent techniques. The global color-color diagrams are obtained with no distinguishable patterns as other objects like accretion disk neutron stars. Strong global correlations for burst timing and spectral properties with hardness-ratios has been found, and the most interesting ones are those between total hardness-ratios (soft/hard) and the bursts’ total counts. That is, the hardness-ratio decreases; in the mean; with the burst-total-counts (more photons = softer spectrum.) Also this result is confirmed by the strong correlations obtained between bursts’ total-counts and both hot-zone temperature (kT) and photon index (). Classification of bursts depending on the burst-duration and the total photons-contained will be taken into consideration in our future studies of bursts.
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Primary author
Mr
Mohammed Hasan Soleiman Yussef
(Cairo University, Faculty of Science, Physics department.)
Co-authors
Dr
Alaa Ibrahim
(2. American University In Cairo, Physics Department, Cairo, Egypt)
Dr
Ali Ellithi
(1. Cairo University, Faculty of Science, Physics Dpartment, Giza, Egypt.)
Prof.
Mohammed Tarek Hussein
(1. Cairo University, Faculty of Science, Physics Dpartment, Giza, Egypt.)