Spectral and timing results of 1ES 1959+650 : J/ApJS/238/13


Authors : Kapanadze B. orcid , Dorner D., Vercellone S. (hide) , Dorner D., Vercellone S. et..al

Bibcode : 2018ApJS..238...13K (ADS) (Simbad) (Objects) (hide)

CDS Keywords : BL Lac objects; X-ray sources; Photometry, UBV; Ultraviolet; Gamma rays
UAT : BL Lacertae objects, X-ray sources, Optical astronomy, Broad band photometry, Ultraviolet astronomy, Gamma-ray astronomy

Observation (OC)

Records :

Inserted into VizieR : 19-Nov-2018
Last modification : 17-Jan-2020

Strong X-ray and multiwavelength flaring activity for 1ES 1959+650, 2016 August-2017 November. (2018)

Keywords : BL Lacertae objects individual (1ES 1959+650)

Abstract:We present the detailed timing and spectral results obtained during the Swift observations of the TeV-detected blazar 1ES 1959+650 in 2016 August-2017 November. The source continued its trend of gradually enhancing X-ray flaring activity in the 0.3-10keV energy range, starting in 2015 August, and a new highest historical brightness state was recorded twice. A long-term high state was superimposed by both weak and strong flares, and we detected 32 instances of intraday X-ray flux variability, including several occasions of extremely fast fluctuations with fractional amplitudes of 5.4%-7.5% within 1ks exposures. The 0.3-10keV spectra generally showed a best fit with the log-parabolic model, yielding a very wide range of the curvature ...(more)
Abstract: (hide)
In this paper, we report the results of the intensive Swift-XRT observations of 1ES 1959+650 during 2016 August-2017 November. The source was targeted 93 times by the XRT during 2016 August 6 and 2017 November 12. The information about each XRT observation and the measurement results are provided in Table 1. Along with these data, we have analyzed the lower-energy data simultaneously obtained with the Ultraviolet/Optical Telescope (UVOT) on board the same satellite; see Table 2. We also constructed light curves for the same period using the publicly available data obtained with (i) the Burst Alert Telescope (BAT) on board Swift, (ii) the Monitor of All Sky X-ray Image (MAXI) device (Matsuoka+, 2009PASJ...61..999M), (iii) the Large Area Telescope (LAT) on board Fermi, (iv) the First G-APD Cherenkov Telescope (FACT), (v) the 40m telescope of Owens Valley Radio Observatory (OVRO , and (vi) the long-term monitoring program MOJAVE (Lister+ 2011, J/AJ/137/3718). The FACT telescope observed 1ES 1959+650 during 237 nights for a total of 591hr in 2016 August-2017 November. See section 2 for further details.

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