6 citations · 16 across the 16 of their papers we have counts for
16 papers
Spectral-Regime Overlap and Transition-like Behavior in the Blazar Population from Multi-Instrument X-ray and TeV Observations
Javaid Tantry, Naseer Iqbal
Blazars are conventionally classified into BL Lac objects and flat-spectrum radio quasars (FSRQs), commonly associated with radiatively inefficient and efficient accretion onto sup…
A Possible Short-Timescale Optical Quasi-Periodic Oscillation in PKS\,080507 from High-Cadence TESS Observations
Sikandar Akbar, Zahir Shah, Athar A. Dar +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…
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…
Spectral State Switching in Mrk 421: Results from the AstroSat LAXPC/SXT Observations
Sikandar Akbar, Zahir Shah, Ranjeev Misra +1
We carried a detailed time and flux resolved X-ray spectral analysis of the high-synchrotron-peaked blazar Mrk\,421 using simultaneous LAXPC20 and SXT observations. The 100\,s binn…
Multi-wavelength analysis of FSRQ B2 1348+30B: Constraints on the jet power
Sajad Ahanger, Sunder Sahayanathan, Sitha K. Jagan +2
We present 14.5-year multi-wavelength analysis of flat-spectrum radio quasar B2 1348+30B using Swift-UVOT, Swift-XRT, and Fermi-LAT observations. In the gamma-ray band, the 3 day b…
An Enhanced Thermodynamic Framework for Third-Order Galaxy Correlation Functions: A Physically Motivated Closure and Observational Test
Sameer Choudhary, Naseer Iqbal
The three-point correlation function (3PCF) is a crucial probe of non-Gaussianity and nonlinear structure formation. We develop a thermodynamic framework for the galaxy 3PCF by clo…
Indication for Dual Periodic Signatures in PKS 0805-07 from Multi-technique Time Series Analysis
Sikandar Akbar, Zahir Shah, Ranjeev Misra +2
We report the identification of two statistically significant quasi-periodic oscillations in the weekly binned -ray light curve of the flat-spectrum radio quasar PKS 080507,…
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 dist…
Study of Multi-Wavelength Variability, Emission Mechanism and Quasi-Periodic Oscillation for Transition Blazar S5 1803+784
Javaid Tantry, Ajay Sharma, Zahir Shah +2
This work present the results of a multi-epoch observational study of the blazar S5\,1803+784, carried out from 2019 to 2023. The analysis is based on simultaneous data obtained fr…
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 energy…
Probing Spectral Evolution and Intrinsic Variability of Mkn\,421: A Multi-Epoch AstroSat Study of X-ray Spectra
Sikandar Akbar, Zahir Shah, Ranjeev Misra +2
Our study presents a time-resolved X-ray spectral analysis of Mkn 421, using AstroSat observations taken during different epochs between 2016 and 2019. The variability of the sourc…
Probing Broadband Spectral Energy Distribution and Variability of Mrk\,501 in the low flux state
Javaid Tantry, Zahir Shah, Ranjeev Misra +2
We conducted a multi-wavelength analysis of the blazar Mrk\,501, utilizing observations from \emph{Astro}Sat (SXT, LAXPC), \emph{Swift-UVOT}, and \emph{Fermi-LAT} during the period…
Insights into the Long-Term Flaring Events of Blazar PKS 0805-07: A Multi-Wavelength Analysis over the 2009-2023 Period
Sikandar A. Dar, Zahir Shah, Ranjeev Misra +1
We conducted a comprehensive temporal and spectral study of the FSRQ PKS 0805-07 by using the broadband observations from the Fermi-LAT and Swift-XRT/UVOT instruments over the peri…
Broadband spectral and temporal study of Ton 599 during the brightest January 2023 flare
Aaqib Manzoor, Zahir Shah, Sunder Sahayanathan +2
In this work, we provide a detailed analysis of the broadband temporal and spectral properties of the blazar Ton\,599 by using the observations from \emph{Fermi}-LAT and \emph{Swif…
Time resolved spectroscopy of a GRS 1915+105 flare during its unusual low state using AstroSat
Sajad Boked, Bari Maqbool, V. Jithesh +3
Since its discovery in 1992, GRS 1915+105 has been among the brightest sources in the X-ray sky. However, in early 2018, it dimmed significantly and has stayed in this faint state…
Can FSRQ 3C 345 be a Very High Energy Blazar Candidate?
Athar A. Dar, Sunder Sahayanathan, Zahir Shah +1
The recent detection of very high energy (VHE) emissions from flat spectrum radio quasars (FSRQs) at high redshifts has revealed that the universe is more transparent to VHE -ra…