Abstract Details

Name: Sharada Keshav Jogdand
Affiliation: S. R. T. M. University, Nanded
Conference ID: ASI2017_1380
Title : X-ray Spectral Analysis of Cyg X-1 source using LAXPC AstroSat Observations
Authors and Co-Authors : Ranjeev Misra, Inter-University Center for Astronomy and Astrophysics, Pune 411007, India; Anjali Rao, Inter-University Center for Astronomy and Astrophysics, Pune 411007, India; Madhav K. Patil, School of Physical Sciences, S.R.T.M. University, Nanded 431606, India and LAXPC Science Team
Abstract Type : Poster
Abstract Category : Stars,ISM and the Galaxy
Abstract : We present the first quick look X-ray spectral analysis of 12 Cygnus X-1 data sets acquired using the ASTROSAT's LAXPC proportional counters LAXPC 10, LAXPC 20 and LAXPC 30 during January 2016. A simple disk blackbody emission model, where Diskbb component was taken to be the seed photon source for the Comptonization, and a Reflionx components was found to constrain the time averaged 3.0-80.0 keV spectrum for the Aug16 responses with a systematic uncertainty of 1.5% and a background flux uncertainty of 4%. The individual spectral fitting of data sets finds slight variations in the estimated spectral parameters. The variations in absorbed flux were observed for LAXPC 10 in range the of -7.813 to -7.757 (+/- 0.0024 to +/-0.0026), LAXPC 20 in the range of -7.760 to -7.708 (+/- 0.0026 to +/-0.0027) and for LAXPC 30 in the range of -7.771 to -7.555 (+/- 0.0024 to +/-0.0027). However, the power law index of the well fitted model was found to rise for LAXPC10 in the range of 1.64 to 1.73 (+/- 0.04 to +/- 0.09), for LAXPC20 in the range of 1.75 to 1.84 (+/- 0.02 to +/-0.02) and for LAXPC30 in the range of 1.67 to 1.77 (+/-0.02 to 0.06 ) during the 12 orbits from 1521 to 1533. Here, We didn't find any correlations between flux and photon index. These results matches the performance of LAXPC in higher energy range and hence confirms that the datasets acquired using these detectors can be suitably used for the scientific studies.