Journal article
Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
Monthly notices of the Royal Astronomical Society, Vol.471(2), pp.2117-2123
08/09/2017
DOI: 10.1093/mnras/stx1756
Abstract
We present very-high-energy γ-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 (χ2/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 (χ2/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 (χ2/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.
Details
- Title: Subtitle
- Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS
- Creators
- C Allen - California Polytechnic State UniversityS Archambault - McGill UniversityA Archer - Washington University in St. LouisW Benbow - Harvard UniversityR Bird - University of California, Los AngelesE Bourbeau - McGill UniversityR Brose - University of PotsdamM Buchovecky - University of California, Los AngelesJ. H Buckley - Washington University in St. LouisV Bugaev - Washington University in St. LouisJ. V Cardenzana - Iowa State UniversityM Cerruti - Harvard UniversityX Chen - University of PotsdamJ. L Christiansen - California Polytechnic State UniversityM. P Connolly - Ollscoil na Gaillimhe – University of GalwayW Cui - Purdue University West LafayetteM. K Daniel - Harvard UniversityJ. D Eisch - Iowa State UniversityA Falcone - Pennsylvania State UniversityQ Feng - McGill UniversityM Fernandez-AlonsoJ. P Finley - Purdue University West LafayetteH FleischhackA Flinders - University of UtahL Fortson - University of MinnesotaA Furniss - California State University, East BayG. H Gillanders - Ollscoil na Gaillimhe – University of GalwayS Griffin - McGill UniversityJ Grube - Stevens Institute of TechnologyM HüttenN Håkansson - University of PotsdamD Hanna - McGill UniversityO Hervet - University of California, Santa CruzJ Holder - University of DelawareG Hughes - Harvard UniversityT. B Humensky - Columbia UniversityC. A Johnson - University of California, Santa CruzP Kaaret - University of IowaP Kar - University of UtahN Kelley-HoskinsM Kertzman - DePauw UniversityD Kieda - University of UtahM KrauseF Krennrich - Iowa State UniversityS Kumar - University of DelawareM. J Lang - Ollscoil na Gaillimhe – University of GalwayG MaierS McArthur - Purdue University West LafayetteA McCann - McGill UniversityK Meagher - Georgia Institute of TechnologyP Moriarty - Ollscoil na Gaillimhe – University of GalwayR Mukherjee - Barnard CollegeT Nguyen - Georgia Institute of TechnologyD Nieto - Columbia UniversityS O'BrienA O’Faoláin de BhróitheR. A Ong - University of California, Los AngelesA. N Otte - Georgia Institute of TechnologyN Park - University of ChicagoA Petrashyk - Columbia UniversityA Pichel - Universidad de Buenos AiresM Pohl - University of PotsdamA Popkow - University of California, Los AngelesE PueschelJ Quinn - University College DublinK Ragan - McGill UniversityP. T ReynoldsG. T Richards - Georgia Institute of TechnologyE Roache - Harvard UniversityA. C Rovero - Universidad de Buenos AiresC Rulten - University of MinnesotaI SadehM Santander - Barnard CollegeG. H Sembroski - Purdue University West LafayetteK Shahinyan - University of MinnesotaI Telezhinsky - University of PotsdamJ. V Tucci - Purdue University West LafayetteJ Tyler - McGill UniversityS. P Wakely - University of ChicagoA Weinstein - Iowa State UniversityA Wilhelm - University of PotsdamD. A Williams - University of California, Santa Cruz
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.471(2), pp.2117-2123
- DOI
- 10.1093/mnras/stx1756
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Publisher
- Oxford University Press
- Language
- English
- Date published
- 08/09/2017
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199924902771
Metrics
14 Record Views