Report
Very-High-Energy $\gamma$-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
pp 2117-2123 (2017). doi:10.1093/mnras/stx1756
2017
Abstract
We present very-high-energy $\gamma$-ray observations of the BL Lac object 1ES 2344+514 taken by the Very Energetic Radiation Imaging Telescope Array System between 2007 and 2015. 1ES 2344+514 is detected with a statistical significance above the background of 20.8σ in 47.2 h (livetime) of observations, making this the most comprehensive very-high-energy study of 1ES 2344+514 to date. Using these observations, the temporal properties of 1ES 2344+514 are studied on short and long times-scales. We fit a constant-flux model to nightly and seasonally binned light curves and apply a fractional variability test to determine the stability of the source on different time-scales. We reject the constant-flux model for the 2007–2008 and 2014–2015 nightly binned light curves and for the long-term seasonally binned light curve at the > 3σ level. The spectra of the time-averaged emission before and after correction for attenuation by the extragalactic background light are obtained. The observed time-averaged spectrum above 200 GeV is satisfactorily fitted ($χ^2$/NDF = 7.89/6) by a power-law function with an index Γ = 2.46 ± 0.06stat ± 0.20sys and extends to at least 8 TeV. The extragalactic-background-light-deabsorbed spectrum is adequately fit ($χ^2$/NDF = 6.73/6) by a power-law function with an index Γ = 2.15 ± 0.06stat ± 0.20sys while an F-test indicates that the power law with an exponential cut-off function provides a marginally better fit ($χ^2$/NDF = 2.56/5) at the 2.1σ level. The source location is found to be consistent with the published radio location and its spatial extent is consistent with a point source.
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- Title
- Very-High-Energy $\gamma$-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
- Creators
- C AllenS ArchambaultA ArcherW BenbowR BirdE BourbeauR Brose - Deutsches Elektronen-SynchrotronM BuchoveckyJ. H BuckleyV BugaevJ. V CardenzanaM CerrutiX ChenJ. L ChristiansenM. P ConnollyW CuiM. K DanielJ. D EischA FalconeQ FengM Fernandez-AlonsoJ. P FinleyH Fleischhack - Deutsches Elektronen-SynchrotronA FlindersL FortsonA FurnissG. H GillandersS GriffinJ GrubeM HüttenN HåkanssonD HannaO HervetJ HolderG HughesT. B HumenskyC. A JohnsonP KaaretP KarN Kelley-Hoskins - Deutsches Elektronen-SynchrotronM KertzmanD KiedaMaria Krause - Deutsches Elektronen-SynchrotronF KrennrichS KumarM. J LangGernot Maier - Deutsches Elektronen-SynchrotronS McArthurA McCannK MeagherP MoriartyR MukherjeeT NguyenD NietoS O'BrienA. O'Faoláin De BhróitheR. A OngA. N OtteN ParkA PetrashykA PichelMartin Pohl - Deutsches Elektronen-SynchrotronA PopkowE Pueschel - Deutsches Elektronen-SynchrotronJ QuinnK RaganP. T ReynoldsG. T RichardsE RoacheA. C RoveroC RultenI Sadeh - Deutsches Elektronen-SynchrotronM SantanderG. H SembroskiK ShahinyanI Telezhinsky - Deutsches Elektronen-SynchrotronJ. V TucciJ TylerS. P WakelyA WeinsteinAlina Wilhelm - Deutsches Elektronen-SynchrotronD. A Williams
- Publication Details
- pp 2117-2123 (2017). doi:10.1093/mnras/stx1756
- Publisher
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
- Resource Type
- Report
- Language
- English
- Academic Unit
- Physics
- Other Identifier
- 991019201364404721