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- W4311549866 abstract "The Cadmium Zinc Telluride Imager (CZTI) onboard AstroSat, an open detector above (sim )100 keV, is a promising tool for the investigation of hard X-ray characteristics of (gamma )-ray pulsars. A custom algorithm has been developed to detect pulsars from long integration ((sim )years) of archival data, as reported by us earlier. Here, we extend this method in the analysis to include additional (sim )20% of the CZTI pixels that were earlier ignored due to their lower gain values. Recent efforts have provided better and more secure calibration of these pixels, demonstrating their higher thresholds and extended energy range up to (sim )1 MeV. Here, we use the additional information provided by these pixels, enabling the construction of pulse profiles over a larger energy range. We compare the profiles of the Crab pulsar at different sub-bands and show that the behavior is consistent with the extended energy coverage. As detailed spectroscopy over this full band remains difficult due to the limited count rate, we construct hardness ratios which, together with AstroSat mass model simulations, are able to constrain the power-law index of the radiation spectrum. We present our results for the phase-resolved spectrum of PSR J0534(+)2200 and for the total pulsed emission of PSR J1513−5908. The recovered photon indices are found to be accurate within ({sim }20)%." @default.
- W4311549866 created "2022-12-27" @default.
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- W4311549866 date "2022-12-06" @default.
- W4311549866 modified "2023-10-10" @default.
- W4311549866 title "Pulsars in AstroSat-CZTI: detection in sub-MeV bands and estimation of spectral index from hardness ratios" @default.
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- W4311549866 doi "https://doi.org/10.1007/s12036-022-09886-9" @default.
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