ASTROSAT LAXPC Biswajit Paul Raman Research Institute Bangalore

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ASTROSAT LAXPC Biswajit Paul Raman Research Institute, Bangalore On behalf of the LAXPC Team

ASTROSAT LAXPC Biswajit Paul Raman Research Institute, Bangalore On behalf of the LAXPC Team

ASTROSAT

ASTROSAT

arge Area X-ray Astronomical Observatorie EXOSAT-ME : 1983 -1986 1. 5 -15 ke. V,

arge Area X-ray Astronomical Observatorie EXOSAT-ME : 1983 -1986 1. 5 -15 ke. V, 1800 sq cm With LE Imaging Telescopes (CMA) GINGA-LAC: 1987 -1991 2 -37 ke. V, 4000 sq cm With All Sky Monitor USA Exp, 2000 sq cm IXAE, 1200 sq cm RXTE-PCA: 1996 -200? 2 -30 ke. V, 6000 sq cm All Sky Monitor and Hard X-ray Instrument ASTROSAT-LAXPC: 2 -80 ke. V, 6000 sq cm With All Sky Monitor, Soft/Hard X-ray Instruments, UVIT

IXAE

IXAE

LAXPC Characteristics Area : 6, 000 - 7, 500 cm 2 Mass: 390 kg

LAXPC Characteristics Area : 6, 000 - 7, 500 cm 2 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 ke. V, ~40% upto 80 ke. V Energy Resolution: 12 -13% at 20 -60 ke. V

LAXPC: Effective Area

LAXPC: Effective Area

LAXPC: Energy Resolution

LAXPC: Energy Resolution

LAXPC: Complex Energy Response • Energy response generation: Monte Carlo simulation / Ground calibration

LAXPC: Complex Energy Response • Energy response generation: Monte Carlo simulation / Ground calibration

Spectral Leakage in PCA and LAXPC PCA LAXPC

Spectral Leakage in PCA and LAXPC PCA LAXPC

Spectral Leakage in PCA

Spectral Leakage in PCA

LAXPC Schematic

LAXPC Schematic

LAXPC: Complex Energy Response PCA: Energy resolution of single events and escape events

LAXPC: Complex Energy Response PCA: Energy resolution of single events and escape events

ASTROSAT Ground Trace

ASTROSAT Ground Trace

LAXPC Advantages Large effective area in hard X-ray band Stable background Low Spectral leakage

LAXPC Advantages Large effective area in hard X-ray band Stable background Low Spectral leakage Wide energy band 2 -80 ke. V with LAXPC 0. 3 -8 ke. V with SXT 10 -150 ke. V 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

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

Timing Studies

Timing Studies

BH High Frequency QPOs (MAXI!)

BH High Frequency QPOs (MAXI!)

CRSF with ASTROSAT LAXPC

CRSF with ASTROSAT LAXPC

Survey with Slew Data and Deep Survey

Survey with Slew Data and Deep Survey

Radio X-ray Simultaneous Observations of Millisecond Pulsars: Absolute Timing

Radio X-ray Simultaneous Observations of Millisecond Pulsars: Absolute Timing

ASTROSAT Launch Window October-December 2011

ASTROSAT Launch Window October-December 2011

Thomson X-ray Polarimeter for a small satellite mission A Thomson X-ray polarimeter has been

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 m. Crab) • No of sources: 50 Unpolarised source Results Polarised source 24