MULTIWAVELENGTH OBSERVATIONS AND MODELING OF 1ES 1959+650 IN A LOW FLUX STATE

E Aliu; M Errando; S Archambault; T Arlen; T Aune; M Beilicke; V Bugaev; R Dickherber; W Benbow; R Bird; E Collins-Hughes; M Boettcher; A Bouvier; K Byrum; A Cesarini; M. P Connolly; L Ciupik; W Cui; C Duke; J Dumm; P Kaaret

doi:10.1088/0004-637X/775/1/3

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MULTIWAVELENGTH OBSERVATIONS AND MODELING OF 1ES 1959+650 IN A LOW FLUX STATE

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MULTIWAVELENGTH OBSERVATIONS AND MODELING OF 1ES 1959+650 IN A LOW FLUX STATE

E Aliu, M Errando, S Archambault, T Arlen, T Aune, M Beilicke, V Bugaev, R Dickherber, W Benbow, R Bird, …

The Astrophysical journal, Vol.775(1), pp.1-8

09/20/2013

DOI: 10.1088/0004-637X/775/1/3

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Abstract

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 ({sigma}) 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 {gamma}-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 {approx}< 2 in the high energy (E > 1 MeV) and very high energy (E > 100 GeV) {gamma}-ray regimes, which is corroborated by the Fermi-LAT, VERITAS, and Whipple 10 m telescope light curves.

Telescopes

ASTROPHYSICS, COSMOLOGY AND ASTRONOMY

BL LACERTAE OBJECTS

ELECTRON BEAM INJECTION

EMISSION

ENERGY SPECTRA

GAMMA RADIATION

GEV RANGE

LUMINOSITY

MEV RANGE

SIMULATION

TEV RANGE

VISIBLE RADIATION

X RADIATION

X-RAY SPECTRA

Details

Title: Subtitle: MULTIWAVELENGTH OBSERVATIONS AND MODELING OF 1ES 1959+650 IN A LOW FLUX STATE
Creators: E Aliu - Columbia University
M Errando - Columbia University
S Archambault - McGill University
T Arlen - University of California, Los Angeles
T Aune - University of California, Los Angeles
M Beilicke - Washington University in St. Louis
V Bugaev - Washington University in St. Louis
R Dickherber - Washington University in St. Louis
W Benbow - Harvard University
R Bird - University College Dublin
E Collins-Hughes - University College Dublin
M Boettcher - Ohio University
A Bouvier - University of California, Santa Cruz
K Byrum - Argonne National Laboratory
A Cesarini - Ollscoil na Gaillimhe – University of Galway
M. P Connolly - Ollscoil na Gaillimhe – University of Galway
L Ciupik - Adler Planetarium
W Cui - Purdue University West Lafayette
C Duke - Grinnell College
J Dumm - University of Minnesota
P Kaaret - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.775(1), pp.1-8
DOI: 10.1088/0004-637X/775/1/3
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Institute of Physics (IOP)
Language: English
Date published: 09/20/2013
Academic Unit: Physics and Astronomy
Record Identifier: 9984199716602771

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