Study of variability in radiation from the Blazar source 3C454.3

ORAL

Abstract

Blazars, a subclass of Active Galactic Nuclei (AGN), are the most promising sources of high energy emission in the known universe. Here, the emission originates from a relativistic jet aligned at or close to the line of sight of the observer. Extending from radio to gamma-ray energies, their broad band spectrum is predominantly non-thermal. Blazars show very high flux variability across the entire electromagnetic spectrum. In this work, we present a study of the long-term variability in radiation from the FSRQ 3C454.3 by constructing flux distributions using 10-year simultaneous optical and gamma ray observations from SPOL at Steward Observatory and Fermi-LAT, respectively. Also, we study flux distribution using X-ray data from AstroSat. We perform investigations of the temporal and spectral variability. As for the temporal analysis, we construct light-curves with the data from all the three bands. Further, we construct the Spectral Energy Distribution (SED) using X-ray data (LAXPC and SXT) and fit the SED with various models viz. power-law, log-parabola and broken power-law.

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Authors

  • Kaustav Dipta Goswami

    Tezpur University

  • Rupjyoti Gogoi

    Arizona State University, Colorado State University, University of Utah, Utah State University, George Mason University, Brigham Young University, University of Colorado, Boulder, Georgia Institute of Technology, University of Colorado, Boulder; North China Electric Power University, Argonne National Laboratory, Carnegie Mellon University, Purdue University, Yunnan University, University of Arizona, Ball Aerospace, Ponderosa Associates Limited, Polsinelli PC, Saleh Research Centre, New Mexico State University, Oak Ridge National Laboratory, Center for Memory and Recording research, Advanced Photon Source, Chemnitz university of technology, Tezpur University

  • Rupjyoti Gogoi

    Arizona State University, Colorado State University, University of Utah, Utah State University, George Mason University, Brigham Young University, University of Colorado, Boulder, Georgia Institute of Technology, University of Colorado, Boulder; North China Electric Power University, Argonne National Laboratory, Carnegie Mellon University, Purdue University, Yunnan University, University of Arizona, Ball Aerospace, Ponderosa Associates Limited, Polsinelli PC, Saleh Research Centre, New Mexico State University, Oak Ridge National Laboratory, Center for Memory and Recording research, Advanced Photon Source, Chemnitz university of technology, Tezpur University