61 citations · 190 across the 14 of their papers we have counts for
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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…
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…