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Cadmium-Zinc-Telluride Imager On-Board Astrosat:A Multi-Faceted Hard X-Ray Instrument


Affiliations
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
2 Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, India
3 Physical Research Laboratory, Ahmedabad 380 009, India
4 Vikram Sarabhai Space Centre, Thiruvananthapuram 695 024, India
 

The AstroSat satellite is designed to make multi-waveband observations of astronomical sources and the Cadmium-Zinc-Telluride Imager (CZTI) instrument of AstroSat covers the hard X-ray band. CZTI has a large area position-sensitive hard X-ray detector equipped with a coded aperture mask, thus enabling simultaneous background measurements. Ability to record simultaneous detection of ionizing interactions in multiple detector elements is a special feature of the instrument, and this is exploited to provide polarization information in the 100-380 keV region. CZTI provides sensitive spectroscopic measurements in the 20-100 keV region, and acts as an all-sky hard X-ray monitor and polarimeter above 100 keV. During the first year of operation, CZTI has recorded several gamma-ray bursts, measured the phase-resolved hard X-ray polarization of the Crab pulsar, and the hard X-ray spectra of many bright galactic X-ray binaries. The excellent timing capability of the instrument has been demonstrated with simultaneous observation of the Crab pulsar with radio telescopes like Gaint Metrewave Radio Telescope and Ooty Radio Telescope.

Keywords

All-Sky Hard X-Ray Monitor, Gamma-Ray Bursts, Neutron Stars, X-Ray Polarization.
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  • Singh, K. P. et al., AstroSat mission. In Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series: Space Telescopes and Instrumentation 2014: UV to Gamma Ray, at Montreal, 2014, vol. 9144, 91441S (p. 15).

  • Bhalerao, V. et al., The Cadmium–Zinc–Telluride Imager on AstroSat. JAA, 2017, 38, 31.

  • Bhalerao, V., Bhattacharya, D., Rao, A. R. and Vadawale, S., GRB151006A: AstroSat CZTI detection. GRB Coordinates Network, 2015, 18422, 1.

  • Rao, A. R. et al., AstroSat CZT Imager observations of GRB151006A: timing, spectroscopy, and polarization study. ApJ, 2016, 833, 86.

  • Bhalerao, V. et al., LIGO/Virgo G211117: AstroSat CZTI upper limits. GRB Coordinates Network, 2016, 19401, 1.

  • Bhalerao, V., Bhattacharya, D., Rao, A. R. and Vadawale, S., GRB170105A: AstroSat CZTI localisation. GRB Coordinates Network, 2016, 20412, 1.

  • Chattopadhyay, T., Vadawale, S. V., Rao, A. R., Sreekumar, S., and Bhattacharya, D., Prospects of hard X-ray polarimetry with AstroSat–CZTI. Exp. Astron., 2014, 37, 555.

  • Vadawale, S. V. et al., Hard X-ray polarimetry with AstroSat–CZTI. Astron. Astrophys., 2015, 578, A73.

  • Buhler, R. and Blandford, R., The surprising Crab pulsar and its nebula: a review. Rep. Prog. Phys., 2014, 77(6), 066901.

  • Lyne, A. G., Pritchard, R. S. and Graham-Smith, F., Twenty-three years of Crab pulsar rotational history. MNRAS, 1993, 265, 1003.


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  • Cadmium-Zinc-Telluride Imager On-Board Astrosat:A Multi-Faceted Hard X-Ray Instrument

Abstract Views: 353  |  PDF Views: 171

Authors

A. R. Rao
Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
D. Bhattacharya
Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, India
V. B. Bhalerao
Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, India
S. V. Vadawale
Physical Research Laboratory, Ahmedabad 380 009, India
S. Sreekumar
Vikram Sarabhai Space Centre, Thiruvananthapuram 695 024, India

Abstract


The AstroSat satellite is designed to make multi-waveband observations of astronomical sources and the Cadmium-Zinc-Telluride Imager (CZTI) instrument of AstroSat covers the hard X-ray band. CZTI has a large area position-sensitive hard X-ray detector equipped with a coded aperture mask, thus enabling simultaneous background measurements. Ability to record simultaneous detection of ionizing interactions in multiple detector elements is a special feature of the instrument, and this is exploited to provide polarization information in the 100-380 keV region. CZTI provides sensitive spectroscopic measurements in the 20-100 keV region, and acts as an all-sky hard X-ray monitor and polarimeter above 100 keV. During the first year of operation, CZTI has recorded several gamma-ray bursts, measured the phase-resolved hard X-ray polarization of the Crab pulsar, and the hard X-ray spectra of many bright galactic X-ray binaries. The excellent timing capability of the instrument has been demonstrated with simultaneous observation of the Crab pulsar with radio telescopes like Gaint Metrewave Radio Telescope and Ooty Radio Telescope.

Keywords


All-Sky Hard X-Ray Monitor, Gamma-Ray Bursts, Neutron Stars, X-Ray Polarization.

References





DOI: https://doi.org/10.18520/cs%2Fv113%2Fi04%2F595-598