Journal article
Investigating Broadband Variability of the TeV Blazar 1ES 1959+650
The Astrophysical journal, Vol.797(2), pp.1-11
12/02/2014
DOI: 10.1088/0004-637X/797/2/89
Abstract
We summarize broadband observations of the TeV-emitting blazar 1ES 1959+650,
including optical R-band observations by the robotic telescopes Super-LOTIS and
iTelescope, UV observations by Swift UVOT, X-ray observations by the Swift
X-ray Telescope (XRT), high-energy gamma-ray observations with the Fermi Large
Area Telescope (LAT) and very-high-energy (VHE) gamma-ray observations by
VERITAS above 315 GeV, all taken between 17 April 2012 and 1 June 2012 (MJD
56034 and 56079). The contemporaneous variability of the broadband spectral
energy distribution is explored in the context of a simple synchrotron self
Compton (SSC) model. In the SSC emission scenario, we find that the parameters
required to represent the high state are significantly different than those in
the low state. Motivated by possible evidence of gas in the vicinity of the
blazar, we also investigate a reflected-emission model to describe the observed
variability pattern. This model assumes that the non-thermal emission from the
jet is reflected by a nearby cloud of gas, allowing the reflected emission to
re-enter the blob and produce an elevated gamma-ray state with no simultaneous
elevated synchrotron flux. The model applied here, although not required to
explain the observed variability pattern, represents one possible scenario
which can describe the observations. As applied to an elevated VHE state of 66%
of the Crab Nebula flux, observed on a single night during the observation
period, the reflected-emission scenario does not support a purely leptonic
non-thermal emission mechanism. The reflected emission model does, however,
predict a reflected photon field with sufficient energy to enable elevated
gamma-ray emission via pion production with protons of energies between 10 and
100 TeV.
Details
- Title: Subtitle
- Investigating Broadband Variability of the TeV Blazar 1ES 1959+650
- Creators
- E Aliu - Columbia UniversityS Archambault - McGill UniversityT Arlen - University of California, Los AngelesT Aune - University of California, Los AngelesA Barnacka - Harvard UniversityM Beilicke - Washington University in St. LouisW Benbow - Harvard UniversityK Berger - University of DelawareR Bird - University College DublinA Bouvier - University of California, Santa CruzJ. H Buckley - Washington University in St. LouisV Bugaev - Washington University in St. LouisM Cerruti - Harvard UniversityX Chen - University of PotsdamL Ciupik - Adler PlanetariumE Collins-Hughes - University College DublinM. P Connolly - Ollscoil na Gaillimhe – University of GalwayW Cui - Purdue University West LafayetteJ Dumm - University of MinnesotaJ. D Eisch - Iowa State UniversityA Falcone - Pennsylvania State UniversityS Federici - University of PotsdamQ Feng - Purdue University West LafayetteJ. P Finley - Purdue University West LafayetteH FleischhackP Fortin - Harvard UniversityL Fortson - University of MinnesotaA Furniss - University of California, Santa CruzN Galante - Harvard UniversityG. H Gillanders - Ollscoil na Gaillimhe – University of GalwayS Griffin - McGill UniversityS. T Griffiths - University of IowaJ Grube - Adler PlanetariumG Gyuk - Adler PlanetariumN Hakansson - University of PotsdamD Hanna - McGill UniversityJ Holder - University of DelawareG HughesT. B Humensky - Columbia UniversityC. A Johnson - University of California, Santa CruzP Kaaret - University of IowaP Kar - University of UtahM Kertzman - DePauw UniversityY Khassen - University College DublinD Kieda - University of UtahH Krawczynski - Washington University in St. LouisF Krennrich - Iowa State UniversityM. J Lang - Ollscoil na Gaillimhe – University of GalwayA. S Madhavan - Iowa State UniversityP Majumdar - Saha Institute of Nuclear PhysicsS McArthur - University of ChicagoA McCann - University of ChicagoK Meagher - Georgia Institute of TechnologyJ Millis - Anderson University - IndianaP Moriarty - Galway-Mayo Institute of TechnologyR Mukherjee - Columbia UniversityT Nelson - University of MinnesotaD Nieto - Columbia UniversityA O’Faoláin de BhróitheR. A Ong - University of California, Los AngelesA. N Otte - Georgia Institute of TechnologyN Park - University of ChicagoJ. S Perkins - Goddard Space Flight CenterM Pohl - University of PotsdamA Popkow - University of California, Los AngelesH ProkophJ Quinn - University College DublinK Ragan - McGill UniversityJ Rajotte - McGill UniversityL. C Reyes - California Polytechnic State UniversityP. T Reynolds - Cork Institute of TechnologyG. T Richards - Georgia Institute of TechnologyE Roache - Harvard UniversityA Sadun - University of Colorado DenverM Santander - Columbia UniversityG. H Sembroski - Purdue University West LafayetteK Shahinyan - University of MinnesotaF Sheidaei - University of UtahA. W Smith - University of UtahD Staszak - McGill UniversityI Telezhinsky - University of PotsdamM Theiling - Purdue University West LafayetteJ Tyler - McGill UniversityA Varlotta - Purdue University West LafayetteV. V Vassiliev - University of California, Los AngelesS VincentS. P Wakely - University of ChicagoT. C Weekes - Harvard UniversityA Weinstein - Iowa State UniversityR WelsingA Wilhelm - University of PotsdamD. A Williams - University of California, Santa CruzB Zitzer - Argonne National LaboratoryM Böttcher - North-West UniversityM FumagalliVERITAS Collaboration
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.797(2), pp.1-11
- DOI
- 10.1088/0004-637X/797/2/89
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Institute of Physics (IOP)
- Language
- English
- Date published
- 12/02/2014
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199721302771
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