X-Ray Observations of 1ES 1959+650 in Its High-activity State in 2016–2017 with AstroSat and Swift - Archive ouverte HAL Access content directly
Journal Articles Astrophys.J. Year : 2021

X-Ray Observations of 1ES 1959+650 in Its High-activity State in 2016–2017 with AstroSat and Swift

Sunil Chandra
  • Function : Author
Markus Boettcher
  • Function : Author
Pranjupriya Goswami
  • Function : Author
Kulinder Pal Singh
  • Function : Author
Navpreet Kaur
  • Function : Author
Sudip Bhattacharyya
  • Function : Author
Shashikiran Ganesh
  • Function : Author
Daniela Dorner
  • Function : Author

Abstract

We present a comprehensive multifrequency study of the high-frequency-peaked BL Lac object 1ES 1959+650 using data from various facilities during the period 2016–2017, including X-ray data from AstroSat and Swift during the historically high X-ray flux state of the source observed until 2021 February. The unprecedented quality of X-ray data from high-cadence monitoring with 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 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 Swift-XRT from 2015 December to 2021 February (exp. = 411.3 ks) reveals a positive correlation between flux and peak position.

Dates and versions

hal-03244337 , version 1 (01-06-2021)

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Sunil Chandra, Markus Boettcher, Pranjupriya Goswami, Kulinder Pal Singh, Michael Zacharias, et al.. X-Ray Observations of 1ES 1959+650 in Its High-activity State in 2016–2017 with AstroSat and Swift. Astrophys.J., 2021, 918 (2), pp.67. ⟨10.3847/1538-4357/ac01d1⟩. ⟨hal-03244337⟩
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