61 citations · 190 across the 14 of their papers we have counts for
14 papers
Understanding the Very High Energy γ-ray excess in nearby blazars using leptonic model
Aaqib Manzoor, Sunder Sahayanathan, Zahir Shah +3
The availability of simultaneous X-ray and Very High Energy (VHE) observations of blazars helps to identify the plausible radiative contributors to the VHE emission. Under leptonic…
Multi-wavelength study of blazar 4C +01.02 during its long-term flaring activity in 2014-2017
Malik Zahoor, Shah Zahir, Sunder Sahayanathan +2
We conducted a detailed long-term spectral and temporal study of flat spectrum radio quasar 4C +01.02, by using the multi-wavelength observations from Fermi-LAT, Swift-XRT, and Swi…
Very High Energy Flat Spectral Radio Quasar Candidates
Zahoor Malik, Sunder Sahayanathan, Zahir Shah +2
The attenuation of very high energy (VHE) photons by the extragalactic background light (EBL) prevents the observation of high redshift flat spectrum radio quasars (FSRQs). However…
Statistical description of galaxy clusters in Finzi model of gravity
Abdul W. Khanday, Sudhaker Upadhyay, Naseer Iqbal +1
We exploit a new theory of gravity proposed by Finzi, which gives stronger interaction at large scales, to study the thermodynamic description of galaxy clusters. We employ a stati…
Model-independent Redshift Estimation of BL Lac Objects through VHE Observations
Malik Zahoor, Sunder Sahayanathan, Shah Zahir +3
The very high energy (VHE) gamma-ray spectral indices of blazars show strong correlation with the source redshift. Absence of any such correlation in low energy gamma rays and X-ra…
Unveiling the broadband spectral and temporal properties of PKS\,0903-57 during its brightest flare
Zahir Shah, V. Jithesh, S. Sahayanathan +1
We carried a detailed spectral and temporal study of blazar, \mbox{PKS\,0903-57} using the \emph{Fermi}-LAT and \emph{Swift}-XRT/UVOT observations, during its brightest flaring per…
Study on Temporal and Spectral behavior of 3C 279 during 2018 January flare
Zahir Shah, V. Jithesh, S. Sahayanathan +2
We present a detailed temporal and spectral study of the blazar 3C\,279 using multi-wavelength observations from Swift-XRT, Swift-UVOT and Fermi-LAT during a flare in 2018 January.…
Log-normal flux distribution of bright Fermi blazars
Zahir Shah, N. Mankuzhiyil, A. Sinha +3
We present the results of the -ray flux distribution study on the brightest blazars which are observed by the \emph{Fermi}-LAT. We selected 50 brightest blazars based on the max…
Modeling the response of a standard accretion disc to stochastic viscous fluctuations
Naveel Ahmad, Ranjeev Misra, Naseer Iqbal +2
The observed variability of X-ray binaries over a wide range of time-scales can be understood in the framework of a stochastic propagation model, where viscous fluctuations at diff…
Clues on High Energy Emission Mechanism from Blazar 3C 454.3 during 2015 August Flare
Zahir Shah, S. Sahayanathan, Nijil Mankuzhiyil +3
We perform a detailed spectral study of a recent flaring activity from the Flat Spectrum Radio Quasar (FSRQ), 3C\,454.3, observed simultaneously in optical, UV, X-ray and -ray e…
A model for the energy-dependent time-lag and rms of the heartbeat oscillations in GRS 1915+105
Mubashir Hamid Mir, Ranjeev Misra, Mayukh Pahari +2
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 compa…
The Effect of X-ray Irradiation on the Time Dependent Behaviour of Accretion Disks with Stochastic Perturbations
Bari Maqbool, Ranjeev Misra, Naseer Iqbal +1
The UV emission from X-ray binaries, is more likely to be produced by reprocessing of X-rays by the outer regions of an accretion disk. The structure of the outer disk may be alter…
The peculiar velocity and temperature profile of galaxy clusters
Tabasum Masood, Naseer Iqbal
Dynamical parameters like average velocity dispersion and temperature profile of galaxy clusters are determined using a quasi equilibrium thermodynamic theory. The calculated veloc…
Correlation functions for extended mass galaxy clusters
Naseer Iqbal, Naveel Ahmad, Mubashir Hamid +1
The phenomenon of clustering of galaxies on the basis of correlation functions in an expanding Universe is studied by using equation of state, taking gravitational interaction betw…