• SUJAY MATE

      Articles written in Journal of Astrophysics and Astronomy

    • The AstroSat mass model: Imaging and flux studies of off-axis sources with CZTI

      SUJAY MATE TANMOY CHATTOPADHYAY VARUN BHALERAO E. AARTHY ARVIND BALASUBRAMANIAN DIPANKAR BHATTACHARYA SOUMYA GUPTA KRISHNAN KUTTY N. P. S. MITHUN SOURAV PALIT A. R. RAO DIVITA SARAOGI SANTOSH VADAWALE AJAY VIBHUTE

      More Details Abstract Fulltext PDF

      The Cadmium Zinc Telluride Imager (CZTI) on AstroSat is a hard X-ray coded-aperture mask instrument with a primary field-of-view of $4.6^{\circ} \times 4.6^{\circ}$ (FWHM).The instrument collimators become increasinglytransparent at energies above $\sim$100 keV, making CZTI sensitive to radiation from the entire sky. While this has enabled CZTI to detect a large number of off-axis transient sources, calculating the source flux or spectrum requires knowledge of the direction and energy dependent attenuation of the radiation incident upon the detector. Here, we present a GEANT4-based mass model of CZTI and AstroSat that can be used to simulate the satellite response to the incident radiation, and to calculate an effective ‘‘response file’’ for converting the source counts into fluxes and spectra. We provide details of the geometry and interaction physics, and validate the model by comparing the simulations of imaging and flux studies with observations. Spectroscopic validation of the massmodel is discussed in a companion paper, Chattopadhyay et al. (J. Astrophys. Astr., vol. 42 (2021) https://doi.org/10.1007/s12036-021-09718-2).

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