C. Allen, S. Archambault, A. Archer, W. Benbow, R. Bird, E. Bourbeau, Robert Brose, M. Buchovecky, J. H. Buckley, V. Bugaev, J. V. Cardenzana, M. Cerruti, Xuhui Chen, J. L. Christiansen, M. P. Connolly, W. Cui, M. K. Daniel, J. D. Eisch, Abe Falcone, Q. Feng, M. Fernandez-Alonso, J. P. Finley, H. Fleischhack, A. Flinders, L. Fortson, A. Furniss, G. H. Gillanders, S. Griffin, J. Grube, M. Huetten, N. Hakansson, D. Hanna, O. Hervet, J. Holder, G. Hughes, T. B. Humensky, C. A. Johnson, P. Kaaret, P. Kar, N. Kelley-Hoskins, M. Kertzman, D. Kieda, M. Krause, F. Krennrich, S. Kumar, M. J. Lang, G. Maier, S. McArthur, A. McCann, K. Meagher, P. Moriarty, R. Mukherjee, T. Nguyen, D. Nieto, R. A. Ong, A. N. Otte, N. Park, A. Petrashyk, A. Pichel, Martin Pohl, A. Popkow, Elisa Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, G. T. Richards, E. Roache, A. C. Rovero, C. Rulten, I. Sadeh, Marcos Santander, G. H. Sembroski, K. Shahinyan, Igor O. Telezhinsky, J. V. Tucci, J. Tyler, S. P. Wakely, A. Weinstein, Alina Wilhelm, D. A. Williams
- 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 20.8 sigma 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 > 3 sigma 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 isWe 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 20.8 sigma 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 > 3 sigma 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 (x(2)/NDF = 7.89/6) by a power-law function with an index Gamma = 2.46 +/- 0.06(stat) +/- 0.20(sys) and extends to at least 8 TeV. The extragalactic-backgroundlight-deabsorbed spectrum is adequately fit (x(2)/NDF = 6.73/6) by a power-law function with an index Gamma = 2.15 +/- 0.06(stat) +/- 0.20(sys) while an F-test indicates that the power law with an exponential cut-off function provides a marginally better fit (x(2)/NDF = 2.56/5) at the 2.1 sigma level. The source location is found to be consistent with the published radio location and its spatial extent is consistent with a point source.…
MetadatenVerfasserangaben: | C. Allen, S. Archambault, A. Archer, W. Benbow, R. Bird, E. Bourbeau, Robert BroseORCiDGND, M. Buchovecky, J. H. Buckley, V. Bugaev, J. V. Cardenzana, M. Cerruti, Xuhui Chen, J. L. Christiansen, M. P. Connolly, W. Cui, M. K. Daniel, J. D. Eisch, Abe Falcone, Q. Feng, M. Fernandez-Alonso, J. P. Finley, H. Fleischhack, A. Flinders, L. Fortson, A. Furniss, G. H. Gillanders, S. Griffin, J. Grube, M. Huetten, N. Hakansson, D. Hanna, O. Hervet, J. Holder, G. Hughes, T. B. Humensky, C. A. Johnson, P. Kaaret, P. Kar, N. Kelley-Hoskins, M. Kertzman, D. Kieda, M. Krause, F. Krennrich, S. Kumar, M. J. Lang, G. Maier, S. McArthur, A. McCann, K. Meagher, P. Moriarty, R. Mukherjee, T. Nguyen, D. Nieto, R. A. Ong, A. N. Otte, N. Park, A. Petrashyk, A. Pichel, Martin PohlORCiDGND, A. Popkow, Elisa PueschelORCiD, J. Quinn, K. Ragan, P. T. Reynolds, G. T. Richards, E. Roache, A. C. Rovero, C. Rulten, I. Sadeh, Marcos Santander, G. H. Sembroski, K. Shahinyan, Igor O. TelezhinskyORCiD, J. V. Tucci, J. Tyler, S. P. Wakely, A. Weinstein, Alina WilhelmORCiDGND, D. A. Williams |
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DOI: | https://doi.org/10.1093/mnras/stx1756 |
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ISSN: | 0035-8711 |
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ISSN: | 1365-2966 |
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Titel des übergeordneten Werks (Englisch): | Monthly notices of the Royal Astronomical Society |
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Verlag: | Oxford Univ. Press |
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Verlagsort: | Oxford |
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Publikationstyp: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Jahr der Erstveröffentlichung: | 2017 |
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Erscheinungsjahr: | 2017 |
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Datum der Freischaltung: | 20.04.2020 |
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Freies Schlagwort / Tag: | BL Lacertae objects: individual: 1ES 2344+514=VERJ2347+517; astroparticle physics; gamma-rays: galaxies |
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Band: | 471 |
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Seitenanzahl: | 7 |
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Erste Seite: | 2117 |
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Letzte Seite: | 2123 |
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Fördernde Institution: | U.S. Department of Energy Office of Science; U.S. National Science Foundation; Smithsonian Institution; NSERC in Canada; UCD |
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Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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Peer Review: | Referiert |
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