A three-year multi-wavelength study of the very-high-energy Î³-ray blazar 1ES 0229+200

E Aliu; S Archambault; T Arlen; T Aune; B Behera; X Chen; M Beilicke; J. H Buckley; V Bugaev; W Benbow; M Cerruti; K Berger; R Bird; A Bouvier; K Byrum; L Ciupik; M. P Connolly; W Cui; C Duke; VERITAS Collaboration; J Dumm

doi:10.1088/0004-637X/782/1/13

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A three-year multi-wavelength study of the very-high-energy Î³-ray blazar 1ES 0229+200

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A three-year multi-wavelength study of the very-high-energy Î³-ray blazar 1ES 0229+200

E Aliu, S Archambault, T Arlen, T Aune, B Behera, X Chen, M Beilicke, J. H Buckley, V Bugaev, W Benbow, …

The Astrophysical journal, Vol.782(1), pp.1-12

02/10/2014

DOI: 10.1088/0004-637X/782/1/13

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Abstract

The high-frequency-peaked BL Lacertae object 1ES 0229+200 is a relatively distant (z = 0.1396), hard-spectrum (Γ ∼ 2.5), very-high-energy (VHE; E > 100 GeV) emitting γ-ray blazar. VHE measurements of this active galactic nucleus have been used to place constraints on the intensity of the extragalactic background light and the intergalactic magnetic field (IGMF). A multi-wavelength study of this object centered around VHE observations by Very Energetic Radiation Imaging Telescope Array System (VERITAS) is presented. This study obtained, over a period of three years, an 11.7 standard deviation detection and an average integral flux F(E > 300 GeV) = (23.3 ± 2.8{sub stat} ± 5.8{sub sys}) × 10{sup –9} photons m{sup –2} s{sup –1}, or 1.7% of the Crab Nebula's flux (assuming the Crab Nebula spectrum measured by H.E.S.S). Supporting observations from Swift and RXTE are analyzed. The Swift observations are combined with previously published Fermi observations and the VHE measurements to produce an overall spectral energy distribution which is then modeled assuming one-zone synchrotron-self-Compton emission. The χ{sup 2} probability of the TeV flux being constant is 1.6%. This, when considered in combination with measured variability in the X-ray band, and the demonstrated variability of many TeV blazars, suggests that the use of blazars such as 1ES 0229+200 for IGMF studies may not be straightforward and challenges models that attribute hard TeV spectra to secondary γ-ray production along the line of sight.

Telescopes

ASTROPHYSICS, COSMOLOGY AND ASTRONOMY

BL LACERTAE OBJECTS

CRAB NEBULA

DETECTION

EMISSION

ENERGY SPECTRA

GALAXIES

GAMMA RADIATION

GEV RANGE

LIMITING VALUES

MAGNETIC FIELDS

SYNCHROTRONS

TEV RANGE

VISIBLE RADIATION

WAVELENGTHS

X RADIATION

Details

Title: Subtitle: A three-year multi-wavelength study of the very-high-energy Î³-ray blazar 1ES 0229+200
Creators: E Aliu - Columbia University
S Archambault - McGill University
T Arlen - University of California, Los Angeles
T Aune - University of California, Los Angeles
B Behera - Deutsches Elektronen-Synchrotron DESY
X Chen - University of Potsdam
M Beilicke - Washington University in St. Louis
J. H Buckley - Washington University in St. Louis
V Bugaev - Washington University in St. Louis
W Benbow - Harvard University
M Cerruti - Harvard University
K Berger - University of Delaware
R Bird - University College Dublin
A Bouvier - University of California, Santa Cruz
K Byrum - Argonne National Laboratory
L Ciupik - Adler Planetarium
M. P Connolly - Ollscoil na Gaillimhe – University of Galway
W Cui - Purdue University West Lafayette
C Duke - Grinnell College
VERITAS Collaboration
J Dumm - University of Minnesota
Contributors: P Kaaret (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.782(1), pp.1-12
DOI: 10.1088/0004-637X/782/1/13
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Institute of Physics (IOP)
Language: English
Date published: 02/10/2014
Academic Unit: Physics and Astronomy
Record Identifier: 9984199697102771

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