6 papers
A Possible Short-Timescale Optical Quasi-Periodic Oscillation in PKS\,080507 from High-Cadence TESS Observations
Sikandar Akbar, Zahir Shah, Naseer Iqbal +1
We present a timing analysis of the high-cadence optical light curve of the high-redshift flat-spectrum radio quasar PKS\,080507 obtained during \textit{TESS} Sector~34 (MJD~=~5…
Broadband Variability Analysis of FSRQ PKS\,0402-362 with Indications of Quasi-Periodic Modulation
Zeeshan Nazir, Sikandar Akbar, Zahir Shah +2
We present a comprehensive temporal and spectral study of the flat-spectrum radio quasar PKS~0402362 using \textit{Fermi}-LAT/Swift-XRT/UVOT observations spanning from MJD 54686…
Multiwavelength spectral and temporal analysis of VHE Blazar 1ES 1959+650: Tracing emission mechanisms across flux states
Peer Anjum, Athar A. Dar, Zahir Shah +2
The high-synchrotron-peaked BL Lac object 1ES\,1959+650 exhibited pronounced activity between MJD~60310 -- 60603, including a very high energy (VHE) detection reported by LHAASO. T…
Comprehensive Variability Analysis of Blazars Using Fermi Light Curves Across Multiple Timescales
Zahir Shah, Athar A. Dar, Sikandar Akbar +8
In this study, we conducted a systematic analysis of long-term Fermi-LAT γ-ray data for a sample of blazars, including FSRQs, BL\,Lacs, and BCUs, to investigate their -ray var…
Statistical Insights into Flux and Photon Index Distributions of VHE FSRQs from Fermi-LAT Observations
Zahoor Malik, Sikandar Akbar, Zahir Shah +8
This study examines the flux and photon index distributions of 11 Very High Energy (VHE) Flat Spectrum Radio Quasars (FSRQs) using over 16 years of Fermi-LAT -ray data. The dis…
Signature of hadronic emission in gamma-ray spectrum of B2 1308+326
Athar A. Dar, Zahir shah, Sunder Sahayanathan +3
The Flat Spectrum Radio Quasar (FSRQ) B2\,1308+326 was in its highest -ray flaring state during 60260-60310\,MJD. During this period, the source was detected in very high energ…