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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/042/0063

    • Keywords

       

      Pulsars: individual (Crab—PSR J0534$+$2200); calibration; hard X-ray; piggyback data; LAT pulsars.

    • Abstract

       

      The Cadmium–Zinc–Telluride Imager (CZTI) is an imaging instrument onboard AstroSat. This instrument operates as a nearly open all-sky detector above 60 keV, making possible long integrations irrespective of the spacecraft pointing. We present a technique based on the AstroSat-CZTI data to explore the hard $\gamma$-ray characteristics of the c-ray pulsar population. We report highly significant ($\sim$30$\sigma$) detection of hard X-ray (60–380 keV) pulse profile of the Crab pulsar using $\sim$5000 ks of CZTI observations within 5 to 70$^{\circ}$ of Crab position in the sky, using a custom algorithm developed by us. Using Crab as our test source, we estimate the off-axis sensitivity of the instrument and establish AstroSat-CZTI as a prospective tool in investigating hard X-ray characteristics of c-ray pulsars as faint as 10 mCrab.

    • Author Affiliations

       

      K. G. ANUSREE1 D. BHATTACHARYA2 A. R. RAO2 3 S. VADAWALE4 V. BHALERAO5 A. VIBHUTE2

      1. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686 560, India.
      2. Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, India.
      3. Tata Institute of Fundamental Research, Mumbai 400 005, India.
      4. Physical Research Laboratory, Ahmedabad 380 009, India.
      5. Indian Institute of Technology Bombay, Mumbai 400 076, India.
    • Dates

       
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