ASTROSAT LAXPC Biswajit Paul Raman Research Institute, Bangalore On behalf of the LAXPC Team ASTROSAT Large Area X-ray Astronomical Observatories EXOSAT-ME : 1983-1986 1.5-15 keV, 1800 sq cm With LE Imaging Telescopes (CMA) GINGA-LAC: 1987-1991 2-37 keV, 4000 sq cm With All Sky Monitor USA Exp,2000 sq cm IXAE, 1200 sq cm RXTE-PCA: 1996-200? 2-30 keV, 6000 sq cm All Sky Monitor and Hard X-ray Instrument ASTROSAT-LAXPC: 2-80 keV, 6000 sq cm With All Sky Monitor, Soft/Hard X-ray Instruments, UVIT IXAE LAXPC Characteristics Area : 6,000 - 7,500 cm2 Mass: 390 kg Time Resolution: 10 µs, dead time 30-35 µs Front-end and Processing Electronics: separate electronics for each detector Data Storage: Onboard Memory 570 MB per Orbit Detection Efficiency: 90-100 % upto 20 keV, ~40% upto 80 keV Energy Resolution: 12-13% at 20-60 keV Life Time: 3-10 Years, no Consumable LAXPC: Effective Area LAXPC: Energy Resolution LAXPC: Complex Energy Response • Energy response generation: Monte Carlo simulation / Ground calibration Spectral Leakage in PCA and LAXPC PCA LAXPC Spectral Leakage in PCA LAXPC Schematic LAXPC: Complex Energy Response PCA: Energy resolution of single events and escape events ASTROSAT Ground Trace LAXPC Advantages Large effective area in hard X-ray band Stable background Low Spectral leakage Wide energy band 2-80 keV with LAXPC 0.3-8 keV with SXT 10-150 keV with CZT Simultaneous, sensitive, multi-band UV/Optical observations Studies with LAXPC Only Timing Instrument it this Time Frame Hard X-ray Response X-ray Pulsars (Pulsations, QPOs, Transient Nature, Orbital Evolutions) LMXBs (KHz and Low Frequency QPOs, Hard X-rays) Millisecond Accreting Pulsars Rotation Powered Pulsars (Simultaneous Radio observations) BHCs (QPOs and variations in a wide range of time scale) Pulsar Cyclotron Line Cluster Hard X-rays ? Sky Survey Sky Monitoring Timing Studies BH High Frequency QPOs (MAXI!) CRSF with ASTROSAT LAXPC Survey with Slew Data and Deep Survey Radio X-ray Simultaneous Observations of Millisecond Pulsars: Absolute Timing ASTROSAT Launch Window October-December 2011 Thomson X-ray Polarimeter for a small satellite mission A Thomson X-ray polarimeter has been designed, developed and successfully tested. Detectors, Front end electronics, Processing Electronics, Collimators with flat top response Test and calibration setup, Rotational stage An Engineering Model is under fabrication •Minimum Detectable Polarisation of 3% at 5σ (50 mCrab) •No of sources: 50 Unpolarised source Results Polarised source 24
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