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Astrophysics > High Energy Astrophysical Phenomena

arXiv:2105.08119 (astro-ph)
[Submitted on 17 May 2021]

Title:X-ray Observations of 1ES 1959+650 in its high activity state in 2016-2017 with AstroSat and Swift

Authors:Sunil Chandra (1), Markus Boettcher (1), Pranjupriya Goswami (2), Kulinder Pal Singh (3 and 4), Michael Zacharias (5 and 1), Navpreet Kaur (6 and 7), Sudip Bhattacharyya (4), Shashikiran Ganesh (8), Daniela Dorner (9) ((1) Center for Space Research, North-West University, Potchefstroom, 2520, South Africa, (2) Department of Physics, Tezpur University, Assam, India, (3) Indian Institute of Science Education and Research, Mohali, Punjab, India, (4) Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400005, India, (5) Laboratoire Univers et Théories, Observatoire de Paris, Université PSL, CNRS, Université de Paris, 92190 Meudon, France, (6) Department of Physics, KTH Royal Institute of Technology, Sweden (7) The Oskar Klein Centre, SE-10691 Stockholm, Sweden, (8) Physical Research Laboratory Ahmedabad, India, (9) Department of Physics and Astronomy, Julius Maximilian University Würzburg, Am Hubland, 97074 Würzburg, Germany)
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Abstract:We present a comprehensive multi-frequency study of the HBL 1ES 1959+650 using data from various facilities during the period 2016-2017, including X-ray data from {\it AstroSat} and {\it Swift} during the historically high X-ray flux state of the source observed until February 2021. The unprecedented quality of X-ray data from high cadence monitoring with the {\it AstroSat} during 2016-2017 enables us to establish a detailed description of X-ray flares in 1ES 1959+650. The synchrotron peak shifts significantly between different flux states, in a manner consistent with a geometric (changing Doppler factor) interpretation. A time-dependent leptonic diffusive-shock-acceleration and radiation transfer model is used to reproduce the spectral energy distributions (SEDs) and X-ray light curves, to provide insight into the particle acceleration during the major activity periods observed in 2016 and 2017. The extensive data of {\it Swift}-XRT from December 2015 to February 2021 (Exp. = 411.3 ks) reveals a positive correlation between flux and peak position.
Comments: 25 pages, 10 figures, 10 tables [Accepted by the Astrophysical Journal]
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:2105.08119 [astro-ph.HE]
  (or arXiv:2105.08119v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.2105.08119
Related DOI: https://doi.org/10.3847/1538-4357/ac01d1

Submission history

From: Sunil Chandra [view email]
[v1] Mon, 17 May 2021 19:12:18 UTC (2,477 KB)
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