1. Very-high-energy γ-ray observations of the blazar 1es 2344+514 with veritas
- Author
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A. Flinders, R. Mukherjee, P. Kaaret, E. Pueschel, A. McCann, D. S. Hanna, Martin Pohl, Maria Krause, Wei Cui, R. A. Ong, David Kieda, F. Krennrich, Daniel Nieto, M. K. Daniel, Wystan Benbow, A. N. Otte, Sinéad M. Griffin, M. P. Connolly, A. Wilhelm, A. Archer, Robert Brose, Moritz Hütten, Cameron H. Allen, J. Grube, C. Rulten, A. Petrashyk, G. H. Gillanders, Etienne Bourbeau, Lucy Fortson, N. H. Park, A. C. Rovero, P. Kar, P. T. Reynolds, N. Håkansson, Henrike Fleischhack, Gordon T. Richards, J. V. Tucci, Gernot Maier, M. Kertzman, A. O'Faolain de Bhroithe, J. Tyler, G. H. Sembroski, Matteo Cerruti, G. Hughes, J. H. Buckley, S. Archambault, M. Buchovecky, Amy Furniss, S. P. Wakely, S. O'Brien, I. Sadeh, A. Popkow, Marcos Santander, Thanh Huy Nguyen, J. V. Cardenzana, C. A. Johnson, K. Ragan, Jodi Christiansen, P. Moriarty, Xuhui Chen, M. Fernandez-Alonso, K. Meagher, Q. Feng, T. B. Humensky, J. P. Finley, John L. Quinn, S. Kumar, A. Pichel, E. Roache, Abraham D. Falcone, Karlen Shahinyan, Ralph Bird, S. McArthur, V. Bugaev, O. Hervet, J. D. Eisch, A. Weinstein, M. J. Lang, N. Kelley-Hoskins, I. Telezhinsky, Jamie Holder, and David A. Williams
- Subjects
gamma-rays: galaxies ,Point source ,Ciencias Físicas ,bl-lacertae objects ,Astrophysics ,telescope ,01 natural sciences ,Spectral line ,spectrum ,purl.org/becyt/ford/1 [https] ,0103 physical sciences ,emission ,ASTROPARTICLE PHYSICS ,Blazar ,010303 astronomy & astrophysics ,Physics ,GALAXIES [GAMMA-RAYS] ,010308 nuclear & particles physics ,variability ,Attenuation ,Gamma ray ,Astronomy ,Institut für Physik und Astronomie ,background-radiation ,Astronomy and Astrophysics ,purl.org/becyt/ford/1.3 [https] ,bl lacertae objects: individual: 1es 2344+514=verj2347+517 ,Light curve ,Astronomía ,radio ,Extragalactic background light ,x-ray ,Space and Planetary Science ,astroparticle physics ,active galactic nuclei ,ddc:520 ,BL LACERTAE OBJECTS ,Astrophysics - High Energy Astrophysical Phenomena ,constraints ,CIENCIAS NATURALES Y EXACTAS ,BL Lac object - 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 (VERITAS) between 2007 and 2015. 1ES 2344+514 is detected with a statistical significance above background of $20.8\sigma$ in $47.2$ hours (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 timescales. 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 (${\chi^2/NDF = 7.89/6}$) by a power-law function with index $\Gamma = 2.46 \pm 0.06_{stat} \pm 0.20_{sys} $ and extends to at least 8 TeV. The extragalactic-background-light-deabsorbed spectrum is adequately fit (${\chi^2/NDF = 6.73/6}$) by a power-law function with index $\Gamma = 2.15 \pm 0.06_{stat} \pm 0.20_{sys} $ while an F-test indicates that the power-law with exponential cutoff function provides a marginally-better fit ($\chi^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., Comment: 7 pages, 2 figures. Published in Monthly Notices of the Royal Astronomical Society
- Published
- 2017