Investigating Broadband Variability of the TeV Blazar 1ES 1959+650

E Aliu; S Archambault; T Arlen; T Aune; A Barnacka; M Beilicke; W Benbow; K Berger; R Bird; A Bouvier; J. H Buckley; V Bugaev; M Cerruti; X Chen; L Ciupik; E Collins-Hughes; M. P Connolly; W Cui; J Dumm; J. D Eisch; A Falcone; S Federici; Q Feng; J. P Finley; H Fleischhack; P Fortin; L Fortson; A Furniss; N Galante; G. H Gillanders; S Griffin; S. T Griffiths; J Grube; G Gyuk; N Hakansson; D Hanna; J Holder; G Hughes; T. B Humensky; C. A Johnson; P Kaaret; P Kar; M Kertzman; Y Khassen; D Kieda; H Krawczynski; F Krennrich; M. J Lang; A. S Madhavan; P Majumdar; S McArthur; A McCann; K Meagher; J Millis; P Moriarty; R Mukherjee; T Nelson; D Nieto; A. O'Faolain de Bhroithe; R. A Ong; A. N Otte; N Park; J. S Perkins; M Pohl; A Popkow; H Prokoph; J Quinn; K Ragan; J Rajotte; L. C Reyes; P. T Reynolds; G. T Richards; E Roache; A Sadun; M Santander; G. H Sembroski; K Shahinyan; F Sheidaei; A. W Smith; D Staszak; I Telezhinsky; M Theiling; J Tyler; A Varlotta; V. V Vassiliev; S Vincent; S. P Wakely; T. C Weekes; A Weinstein; R Welsing; A Wilhelm; D. A Williams; B Zitzer; M Böttcher; M Fumagalli; VERITAS Collaboration

doi:10.1088/0004-637X/797/2/89

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Investigating Broadband Variability of the TeV Blazar 1ES 1959+650

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Investigating Broadband Variability of the TeV Blazar 1ES 1959+650

E Aliu, S Archambault, T Arlen, T Aune, A Barnacka, M Beilicke, W Benbow, K Berger, R Bird, A Bouvier, …

The Astrophysical journal, v 797(2)

02 Dec 2014

DOI: https://doi.org/10.1088/0004-637X/797/2/89

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Abstract

Physics - High Energy Astrophysical Phenomena

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.

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28 citations in Web of Science

36 citations in Scopus

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Title: Investigating Broadband Variability of the TeV Blazar 1ES 1959+650
Creators: E Aliu - Columbia University
S Archambault - McGill University
T Arlen - University of California, Los Angeles
T Aune - University of California, Los Angeles
A Barnacka - Harvard University
M Beilicke - Washington University in St. Louis
W Benbow - Harvard University
K Berger - University of Delaware
R Bird - University College Dublin
A Bouvier - Santa Cruz Institute for Particle Physics
J. H Buckley - Washington University in St. Louis
V Bugaev - Washington University in St. Louis
M Cerruti - Harvard University
X Chen - University of Potsdam
L Ciupik - Adler Planetarium
E Collins-Hughes - University College Dublin
M. P Connolly - National University of Ireland, Galway
W Cui - Purdue University West Lafayette
J Dumm - University of Minnesota
J. D Eisch - Iowa State University
A Falcone - Pennsylvania State University
S Federici - University of Potsdam
Q Feng - Purdue University West Lafayette
J. P Finley - Purdue University West Lafayette
H Fleischhack - The VERITAS Collaboration
P Fortin - Harvard University
L Fortson - University of Minnesota
A Furniss - Santa Cruz Institute for Particle Physics
N Galante - Harvard University
G. H Gillanders - National University of Ireland, Galway
S Griffin - McGill University
S. T Griffiths - University of Iowa
J Grube - Adler Planetarium
G Gyuk - Adler Planetarium
N Hakansson - University of Potsdam
D Hanna - McGill University
J Holder - University of Delaware
G Hughes - The VERITAS Collaboration
T. B Humensky - Columbia University
C. A Johnson - Veritas (United States)
P Kaaret - University of Iowa
P Kar - University of Utah
M Kertzman - DePauw University
Y Khassen - University College Dublin
D Kieda - University of Utah
H Krawczynski - Washington University in St. Louis
F Krennrich - Iowa State University
M. J Lang - National University of Ireland, Galway
A. S Madhavan - Iowa State University
P Majumdar - Saha Institute of Nuclear Physics
S McArthur - University of Chicago
A McCann - University of Chicago
K Meagher - Georgia Institute of Technology
J Millis - Anderson University - Indiana
P Moriarty - Galway-Mayo Institute of Technology
R Mukherjee - Columbia University
T Nelson - Veritas (United States)
D Nieto - Columbia University
A. O'Faolain de Bhroithe - The VERITAS Collaboration
R. A Ong - University of California, Los Angeles
A. N Otte - Georgia Institute of Technology
N Park - University of Chicago
J. S Perkins - Goddard Space Flight Center
M Pohl - University of Potsdam
A Popkow - University of California, Los Angeles
H Prokoph - The VERITAS Collaboration
J Quinn - University College Dublin
K Ragan - McGill University
J Rajotte - McGill University
L. C Reyes - California Polytechnic State University
P. T Reynolds - Cork Institute of Technology
G. T Richards - Georgia Institute of Technology
E Roache - Harvard University
A Sadun - University of Colorado Denver
M Santander - Columbia University
G. H Sembroski - Purdue University West Lafayette
K Shahinyan - University of Minnesota
F Sheidaei - University of Utah
A. W Smith - University of Utah
D Staszak - McGill University
I Telezhinsky - University of Potsdam
M Theiling - Purdue University West Lafayette
J Tyler - McGill University
A Varlotta - Purdue University West Lafayette
V. V Vassiliev - University of California, Los Angeles
S Vincent - The VERITAS Collaboration
S. P Wakely - University of Chicago
T. C Weekes - Harvard University
A Weinstein - The VERITAS Collaboration
R Welsing - The VERITAS Collaboration
A Wilhelm - University of Potsdam
D. A Williams - Santa Cruz Institute for Particle Physics
B Zitzer - Argonne National Laboratory
M Böttcher - North-West University
M Fumagalli
VERITAS Collaboration
Publication Details: The Astrophysical journal, v 797(2)
Publisher: Institute of Physics (IOP)
Resource Type: Journal article
Language: English
Academic Unit: Physics
Web of Science ID: WOS:000346291600017
Scopus ID: 2-s2.0-84916612983
Other Identifier: 991019201378504721

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Collaboration types: Domestic collaboration; International collaboration
Web of Science research areas: Astronomy & Astrophysics

Investigating Broadband Variability of the TeV Blazar 1ES 1959+650

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