8 papers · 1 filter
GRS 1915+105: the distance, radiative processes and energy-dependent variability
Andrzej A. Zdziarski, Marek Gierlinski, A. R. Rao +2
We present an exhaustive analysis of five broad-band observations of GRS 1915+105 in two variability states, chi and omega, observed simultaneously by the PCA, HEXTE and OSSE. We f…
Multipixel characterization of imaging CZT detectors for hard X-ray imaging and spectroscopy
S. V. Vadawale, J. Hong, J. Grindlay +8
We report our in-depth study of Cd-Zn-Te (CZT) crystals to determine an optimum pixel and guard band configuration for Hard X-ray imaging and spectroscopy. We tested 20x20x5mm crys…
Laboratory coded aperture imaging experiments: radial hole coded masks and depth-sensitive CZT detectors
J. Hong, S. V. Vadawale, M. Zhang +5
The proposed black-hole finder mission EXIST will consist of multiple wide-field hard X-ray coded-aperture telescopes. The high science goals set for the mission require innovation…
Ejection of the inner accretion disk in GRS 1915+105: the magnetic rubber-band effect
A. Nandi, S. K. Chakrabarti, S. V. Vadawale +1
We examine theoretically the behaviour of the inner accretion disk in GRS 1915+105 when soft X-ray dips are present in the X-ray light curve. We assume the presence of a radial sho…
On the origin of the various types of radio emission in GRS 1915+105
S. V. Vadawale, A. R. Rao, S. Naik +4
We investigate the association between the radio ``plateau'' states and the large superluminal flares in GRS 1915+105 and propose a qualitative scenario to explain this association…
Correlated radio:X-ray emission in the hard states of Galactic microquasars
M. Choudhury, A. R. Rao, S. V. Vadawale +1
We present results of our study of correlated radio and X-ray emission in two black hole candidates and Galactic microquasars GRS 1915+105 and Cygnus X-1 in their steady long term…