High Energy Astrophysics in India :

ASTROSAT and Future

X-ray Astronomy in India

PAST

PRESENT

FUTURE

IXAE

ROCKET

BALLOON

Black hole studies

with IXAE

Rapid X-ray variabilityand

quasi periodic oscillations

Possible evidence ofblack event horizon

Superluminal motion in the

Galactic microquasar GRS 1915+105

Rapid changes in the

state of the black hole accretion disk

Association betweenradio flare

andX-ray activity

Pulsar studies with the

Indian X-ray Astronomy

Experiment (IXAE)

Energy dependenceof the Crab pulsar profile

Profile change intransient X-ray pulsarchange in accretion mode!!

Quasi periodic oscillations in X-rayPulsar, a rare phenomenon

Pulse periodand

profileevolution

in transient

X-rayPulsars

ASTROSAT (2005/2006) Indian Multi-wavelength

Astronomy Satellite

Ultraviolet Imaging TelescopeSoft X-ray TelescopeX-ray Sky MonitorCadmium Zinc Telluride ArrayArray of Large Area X-ray

Proportional Counters

Broad band X-ray spectroscopyBlack holes, Pulsars, AGNs etcIsolating thermal and nonthermal

components, cyclotron lines etc.X-ray TimingPulsars, Black holes, AGNs etc.Periodic, quasiperiodic and aperiodic variabilities

LAXPC

LAXPC: Large-Area Xenon Proportional Counter

High Energy Imager

:

CZTI: Cd-Zn-Te Imager

Soft X-ray Telescope

Scanning Sky Monitor

SSM:Sky Survey Monitor

Very Large Area (6,000 –7,500 cm2) High Detection Efficiency High Time Resolution Good Energy Resolution X-ray Polarisation

LAXPC Sensitivity

Cyclotron Absorptionin Neutron Star

Galactic Point Sources

Accreting Millisecond Pulsar(s) Transient Sources

Nonthermal Emission inClusters of GalaxiesMagnetic Field and Energy Density

Black Hole Studies with Black Hole Studies with the ASTROSATthe ASTROSAT

Galactic Point Sources

Active Galactic Nuclei

Galactic BHCs

Persistent SourcesBlack Hole Candidates (broad band spectroscopy)

Transient Sources

Aperiodic variabilities, high and low freq QPOs

Galactic Point Sources

Relation between spectral and temporal variations

The Elephand and the Ant

B

Active Galactic Nuclei(Seyfert galaxies, Quasars, BL LACs)

Continuum Spectra (quasi) Periodic and Aperiodic

Variabilities Emission Line Variabilities

Active Galactic Nuclei(Seyfert galaxies, Quasars, BL LACs)

Broad band continuum spectraOrder of magnitude improvement in sensitivity at hard X-rays with ASTROSAT

Active Galactic Nuclei(Seyfert galaxies, Quasars, BL LACs)

(quasi) Periodic Variabilities

Active Galactic Nuclei(Seyfert galaxies, Quasars, BL LACs)

and Aperiodic Variabilities