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001     156860
005     20250730152035.0
024 7 _ |2 doi
|a 10.1088/0004-637X/775/1/3
024 7 _ |2 ISSN
|a 0004-637X
024 7 _ |2 ISSN
|a 1538-4357
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037 _ _ |a DESY-2014-00171
082 _ _ |a 520
100 1 _ |0 P:(DE-HGF)0
|a Aliu, E.
|b 0
|e Corresponding author
245 _ _ |a MULTIWAVELENGTH OBSERVATIONS AND MODELING OF 1ES 1959+650 IN A LOW FLUX STATE
260 _ _ |a Chicago, Ill. [u.a.]
|b Univ.11032
|c 2013
336 7 _ |0 0
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|a Journal Article
336 7 _ |2 DRIVER
|a article
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|b journal
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|s 156860
336 7 _ |2 BibTeX
|a ARTICLE
500 _ _ |3 POF3_Assignment on 2016-02-09
520 _ _ |a We report on the VERITAS observations of the high-frequency peaked BL Lac object 1ES 1959+650 in the period 2007-2011. This source is detected at TeV energies by VERITAS at 16.4 standard deviation (σ) significance in 7.6 hr of observation in a low flux state. A multiwavelength spectral energy distribution (SED) is constructed from contemporaneous data from VERITAS, Fermi-LAT, RXTE PCA, and Swift UVOT. Swift XRT data is not included in the SED due to a lack of simultaneous observations with VERITAS. In contrast to the orphan γ-ray flare exhibited by this source in 2002, the X-ray flux of the source is found to vary by an order of magnitude, while other energy regimes exhibit less variable emission. A quasi-equilibrium synchrotron self-Compton model with an additional external radiation field is used to describe three SEDs corresponding to the lowest, highest, and average X-ray states. The variation in the X-ray spectrum is modeled by changing the electron injection spectral index, with minor adjustments of the kinetic luminosity in electrons. This scenario produces small-scale flux variability of the order of lsim 2 in the high energy (E > 1 MeV) and very high energy (E > 100 GeV) γ-ray regimes, which is corroborated by the Fermi-LAT, VERITAS, and Whipple 10 m telescope light curves.
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