6 papers
Exploring the Transitional Parameter Space of Blazars using Gamma-ray and X-ray Population Diagnostics
Zahoor Malik, Sikandar Akbar, Zahir Shah
We investigate the -ray and X-ray population properties of changing-look blazars (CLBs) using sources from the Fourth \textit{Fermi} LAT Source Catalog Data Release 4 (4FGL-DR4…
Indication of gamma-Ray Quasi-periodicity in GB6 J1037+5711 from Multi-technique Timing Analysis
Zahoor Malik, Sikandar Akbar, Zahir Shah +1
We report the indication of a long-term quasi-periodic oscillation (QPO) in the -ray emission of the BL Lac object 4FGL J1037.7+5711 (GB6 J1037+5711) using more than 17 years o…
Modelling the Time-variable Broadband Emission and Correlation Study of FSRQ S5 1044+71
Sajad Ahanger, Shah Zahir, Sunder Sahayanathan +3
We present a detailed temporal and spectral analysis of the blazar S5\,1044+71 using multi-wavelength data obtained from the \emph{Fermi}-LAT and Swift-XRT/UVOT telescopes. Applyin…
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…
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…