Large Area X-Ray Proportional Counter (LAXPC) Instrument on AstroSat and Some Preliminary Results from its Performance in the Orbit |
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| Authors: | P C Agrawal J S Yadav H M Antia Dhiraj Dedhia P Shah Jai Verdhan Chauhan R K Manchanda V R Chitnis V M Gujar Tilak Katoch V N Kurhade P Madhwani T K Manojkumar V A Nikam A S Pandya J V Parmar D M Pawar Jayashree Roy B Paul Mayukh Pahari Ranjeev Misra M H Ravichandran K Anilkumar C C Joseph K H Navalgund R Pandiyan K S Sarma K Subbarao |
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| Institution: | 1.UM-DAE Center of Excellence for Basic Sciences,University of Mumbai Campus at Vidhyanagar,Kalina, Mumbai,India;2.Tata Institute of Fundamental Research,Mumbai,India;3.University of Mumbai,Kalina, Mumbai,India;4.Department of Astronomy and Astrophysics,Raman Research Institute,Bengaluru,India;5.Inter-University Centre for Astronomy and Astrophysics,Ganeshkhind, Pune,India;6.ISRO Inertial Systems Unit (IISU),Vattiyoorkavu, Trivandrum,India;7.ISRO Satellite Center,Bengaluru,India |
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| Abstract: | Large area X-ray propositional counter (LAXPC) instrument on AstroSat is aimed at providing high time resolution X-ray observations in 3–80 keV energy band with moderate energy resolution. To achieve large collecting area, a cluster of three co-aligned identical LAXPC detectors, is used to realize an effective area in access of \({\sim }6000\,\hbox {cm}^{2}\) at 15 keV. The large detection volume of the LAXPC detectors, filled with xenon gas at \({\sim }\)2 atmosphere pressure, results in detection efficiency greater than 50%, above 30 keV. In this article, we present salient features of the LAXPC detectors, their testing and characterization in the laboratory prior to launch and calibration in the orbit. Some preliminary results on timing and spectral characteristics of a few X-ray binaries and other type of sources, are briefly discussed to demonstrate that the LAXPC instrument is performing as planned in the orbit. |
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