Title: Imaging and Spectroscopy Methods for Indirect Imaging

Speaker: Dr. Ajay Vibhute, National Radio Astronomy Observatory, USA

Abstract: Conventional imaging and spectroscopy methods are often unsuitable for observing high-energy astrophysical sources, such as those emitting X-rays, due to the penetrating nature of these photons and the limitations of traditional optics at such energies. This necessitates the use of indirect imaging techniques, which rely on alternative methods like coded aperture masks. In this talk, the author will provide an overview of the key imaging and spectroscopy methods employed for high-energy astrophysics, with a particular focus on their implementation in the Cadmium Zinc Telluride Imager (CZTI) onboard AstroSat, India's first dedicated multi-wavelength space observatory. The talk will highlight how these techniques enable the detection, localization, and spectral characterization of high-energy cosmic sources and their effectiveness.