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http://hdl.handle.net/20.500.12386/25877
Title: | A recent strong X-ray flaring activity of 1ES 1959+650 with possibly less efficient stochastic acceleration | Authors: | Kapanadze, B. Dorner, D. VERCELLONE, STEFANO ROMANO, Patrizia Kapanadze, S. Mdzinarishvili, T. |
Issue Date: | 2016 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 461 | Issue: | 1 | First Page: | L26 | Abstract: | We present an X-ray flaring activity of 1ES 1959+650 in 2015 August-2016 January, which was the most powerful and prolonged during the 10.75 yr period since the start of its monitoring with X-ray Telescope onboard Swift. A new highest historical 0.3-10 keV count rate was recorded three times that makes this object the third BL Lacertae source exceeding the level of 20 counts s<SUP>-1</SUP>. Along with the overall variability by a factor of 5.7, this epoch was characterized by fast X-ray flares by a factor of 2.0-3.1, accompanied with an extreme spectral variability. The source also shows a simultaneous flaring activity in the optical - UV and 0.3-100 GeV bands, although a fast γ-ray flare without significant optical - X-ray counterparts is also found. In contrast to the X-ray flares in the previous years, the stochastic acceleration seems be less important for the electrons responsible for producing X-ray emission during this flare that challenges the earlier suggestion that the electrons in the jets of TeV-detected BL Lacertae objects should undergo an efficient stochastic acceleration resulting in a lower X-ray spectral curvature. | URI: | http://hdl.handle.net/20.500.12386/25877 | URL: | https://academic.oup.com/mnrasl/article/461/1/L26/2589500 | ISSN: | 0035-8711 | DOI: | 10.1093/mnrasl/slw054 | Bibcode ADS: | 2016MNRAS.461L..26K | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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