Naseer Iqbal

A model for the energy-dependent time-lag and rms of the heartbeat oscillations in GRS 1915+105

Energy dependent phase lags reveal crucial information about the causal relation between various spectral components and about the nature of the accretion geometry around the compact objects. The time-lag and the fractional root mean square (rms) spectra of GRS 1915+105 in its heartbeat oscillation class/

Gravitational Clustering of Galaxies in an Expanding Universe

\rho

Correlation functions for extended mass galaxy clusters

state show peculiar behaviour at the fundamental and harmonic frequencies where the lags at the fundamental show a turn around at

Modeling the response of a standard accretion disc to stochastic viscous fluctuations

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STUDIES OF VLF RADIO WAVES FOR SUDDEN IONOSPHERIC DISTURBANCES (SID) IN KASHMIR REGION

10 keV while the lags at the harmonic do not show any turn around at least till

Long range gas-geochemical anomalies of a remote earthquake recorded simultaneously at distant monitoring stations in India

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Some early astronomical sites in the Kashmir region

20 keV. The magnitude of lags are of the order of few seconds and hence cannot be attributed to the light travel time effects or Comptonization delays. The continuum X-ray spectra can roughly be described by a disk blackbody and a hard X-ray power-law component and from phase resolved spectroscopy it has been shown that the inner disk radius varies during the oscillation. Here, we propose that there is a delayed response of the inner disk radius (DROID) to the accretion rate such that

Entropy changes in the clustering of galaxies in an expanding universe

r_{in}(t)\propto \dot{m}^\beta (t-\tau_d)

Peculiar motions of galaxy clusters: correlation function approach

. The fluctuating accretion rate drives the oscillations of the inner radius after a time delay

Log-normal flux distribution of bright Fermi blazars.

\tau_d