Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state

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 distri...

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Detalles Bibliográficos
Publicado: 2013
Materias:
BL Lacertae objects: general
galaxies: active
gamma rays: galaxies
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v775_n1_p_Aliu
http://hdl.handle.net/20.500.12110/paper_0004637X_v775_n1_p_Aliu
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0004637X_v775_n1_p_Aliu
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spelling paper:paper_0004637X_v775_n1_p_Aliu2025-07-30T17:12:33Z Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state BL Lacertae objects: general galaxies: active gamma rays: galaxies 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 ≲ 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. © 2013. The American Astronomical Society. All rights reserved.. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v775_n1_p_Aliu http://hdl.handle.net/20.500.12110/paper_0004637X_v775_n1_p_Aliu
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic BL Lacertae objects: general
galaxies: active
gamma rays: galaxies
spellingShingle BL Lacertae objects: general
galaxies: active
gamma rays: galaxies
Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state
topic_facet BL Lacertae objects: general
galaxies: active
gamma rays: galaxies
description 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 ≲ 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. © 2013. The American Astronomical Society. All rights reserved..
title Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state
title_short Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state
title_full Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state
title_fullStr Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state
title_full_unstemmed Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state
title_sort multiwavelength observations and modeling of 1es 1959+650 in a low flux state
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v775_n1_p_Aliu
http://hdl.handle.net/20.500.12110/paper_0004637X_v775_n1_p_Aliu
_version_ 1840321469616226304

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