Abstract Details
| Name: Santosh Vadawale Affiliation: Physical Research Laboratory Conference ID: ASI2015_735 Title : Hard X-ray polarimetry with Astrosat-CZTI Authors and Co-Authors : On behalf of CZTI team Abstract Type : Poster Abstract Category : Instrumentation and Techniques Abstract : Cadmium Zing Telluride Imager (CZTI) is one of the five instruments on Astrosat with primary scientific objective of simultaneous X-ray spectroscopy and imaging in the energy range of 10 – 150 keV. It is based on pixilated CZT detector array with total geometric area of 1024 sq. cm. Individual CZT pixels are of 2.5 mm x 2.5 mm size and 5 mm thick. Such pixilated detector plan can in principle be used for hard X-ray polarization measurements based on the principle of Compton scattering by measuring azimuthal distribution of simultaneous events in two adjacent pixels. We have carried out detailed Geant4 simulations to show that CZTI will be able to measure X-ray polarization the energy range of 100 – 300 keV. This capability has also been verified experimentally. The detailed estimation of polarimetric background, which determines the realistic polarization sensitivity of CZTI, show that the CZTI will certainly be able to constrain the hard X-ray polarization of bright X-ray sources, if the emission is highly polarized. We show that this sensitivity can address some important in X-ray astronomy such as contribution of relativistic jets to hard X-rays in the black hole binaries and the X-ray emission mechanism and geometry in the X-ray pulsars. |