MULTIWAVELENGTH OBSERVATIONS OF THE AGN 1ES 0414+009 WITH VERITAS, FERMI -LAT, SWIFT -XRT, AND MDM

We present observations of the BL Lac object 1ES 0414+009 in the >200 GeV gamma-ray band by the VERITAS array of Cherenkov telescopes. 1ES 0414+009 was observed by VERITAS between 2008 January and 2011 February, resulting in 56.2 hr of good quality pointed observations. These observations resulte...

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Bibliographic Details
Published in:The Astrophysical journal 2012-08, Vol.755 (2), p.1-7
Main Authors: Aliu, E, Archambault, S, Arlen, T, Aune, T, BEILICKE, M, Benbow, W, Bottcher, M, Bouvier, A, Bugaev, V, Cannon, A
Format: Article
Language:English
Subjects:
Arrays
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Bands
BL LACERTAE OBJECTS
COMPUTERIZED SIMULATION
COSMIC PHOTONS
CRAB NEBULA
ENERGY SPECTRA
Flux
GALAXIES
GAMMA ASTRONOMY
GAMMA RADIATION
GEV RANGE
HADRONS
INDEXES
Mathematical models
PHOTON EMISSION
Photons
RADIATION DETECTION
Spectral energy distribution
Standard deviation
TELESCOPE COUNTERS
X RADIATION
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Summary:We present observations of the BL Lac object 1ES 0414+009 in the >200 GeV gamma-ray band by the VERITAS array of Cherenkov telescopes. 1ES 0414+009 was observed by VERITAS between 2008 January and 2011 February, resulting in 56.2 hr of good quality pointed observations. These observations resulted in a detection of 822 events from the source corresponding to a statistical significance of 6.4 standard deviations (6.4[sigma]) above the background. The source flux, showing no evidence for variability, is measured as (5.2 + or - 1.1 sub(stat) + or - 2.6 sub(sys)) x 10 super(-12) photons cm super(-2) s super(-1) above 200 GeV, equivalent to approximately 2% of the Crab Nebula flux above this energy. The differential photon spectrum from 230 GeV to 850 GeV is well fit by a power law with a photon index of [Gamma] = 3.4 + or - 0.5 sub(stat) + or - 0.3 sub(sys) and a flux normalization of (1.6 + or - 0.3 sub(stat) + or - 0.8 sub(sys)) x 10 super(-11) photons cm super(-2) s super(-1) at 300 GeV. We also present multiwavelength results taken in the optical (MDM), x-ray (Swift-XRT), and GeV (Fermi-LAT) bands and use these results to construct a broadband spectral energy distribution (SED). Modeling of this SED indicates that homogenous one-zone leptonic scenarios are not adequate to describe emission from the system, with a lepto-hadronic model providing a better fit to the data.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/755/2/118