A multiwavelength study of flaring activity in the high-energy peaked BL lac object 1ES 1959+650 during 2015-2016

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dc.contributor.author Kaur, Navpreet
dc.contributor.author Chandra, Sunil
dc.contributor.author Baliyan, Kiran S.
dc.contributor.author Sameer
dc.contributor.author Ganesh, Shashikiran
dc.date.accessioned 2017-10-03T10:52:41Z
dc.date.available 2017-10-03T10:52:41Z
dc.date.issued 2017-09
dc.identifier.citation Kaur, Navpreet; Chandra, S.; Baliyan, Kiran S.; Sameer and Ganesh, S., "A multiwavelength study of flaring activity in the high-energy peaked BL lac object 1ES 1959+650 during 2015-2016", The Astrophysical Journal, DOI: 10.3847/1538-4357/aa86b0, vol. 846, no. 2, Sep. 2017. en_US
dc.identifier.issn 1538-4357
dc.identifier.uri http://dx.doi.org/10.3847/1538-4357/aa86b0
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/3157
dc.description.abstract We present the results from a multiwavelength study of the flaring activity in the high-energy peaked BL Lac object 1ES 1959+650 during 2015 January–2016 June. The source underwent two major outbursts, during 2015 March and 2015 October, across the whole electromagnetic spectrum (EMS). We used data from Fermi-LAT and Swift-XRT/UVOT, and optical data from Mt. Abu InfraRed Observatory and Steward Observatory to look for possible correlations between the emissions at different energies and the nature of the variability during the flaring state. During the 2015 October outburst, the nightly averaged V-band brightest magnitude, 14.45(0.03), and faintest magnitude, 14.45(0.03), were recorded. Apart from long-term flares, rapid and short-term variabilities were noticed at all energies. Our study suggests that the flaring activities at all frequencies, with diverse flare durations and time lags, are correlated. The magnetic field strength is estimated to be 4 G using the synchrotron-cooling timescale (2.3 hr), and the upper limits on the sizes of both emission regions, γ-ray and optical, are estimated to be of the order of 1016 cm. The quasi-simultaneous flux enhancements in 15 GHz and VHE γ-ray emissions indicate a fresh injection of plasma into the jet, which interacts with a standing submillimeter core, resulting in co-spatial emissions across the EMS. The synchrotron peak shifts to higher frequency in the spectral energy distribution while the γ-ray spectra softens during the flaring. The shape of the inverse-Compton spectra indicates a change in the particle energy distribution pre- and post-flare.
dc.description.statementofresponsibility by Navpreet Kaur, Sunil Chandra, Kiran S Baliyan, Sameer and S. Ganesh
dc.format.extent vol. 846, no. 2
dc.language.iso en en_US
dc.publisher American Astronomical Society en_US
dc.subject BL Lacertae objects:individual(1ES 1959+650) en_US
dc.subject galaxies:active en_US
dc.subject galaxies:jets en_US
dc.subject methods:observational en_US
dc.subject quasars:supermassive black holes en_US
dc.subject techniques:photometric en_US
dc.title A multiwavelength study of flaring activity in the high-energy peaked BL lac object 1ES 1959+650 during 2015-2016 en_US
dc.type Article en_US
dc.relation.journal Astrophysical Journal


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