Very-high-energy γ -ray observations of the Blazar 1ES 2344+514 with VERITAS

Allen, C.; Archambault, S.; Archer, A.; Benbow, W.; Bird, R.; Bourbeau, E.; Brose, R.; Buchovecky, M.; Buckley, J.H.; Bugaev, V.; Cardenzana, J.V.; Cerruti, M.; Chen, X.; Christiansen, J.L.; Connolly, M.P.; Cui, W.; Daniel, M.K.; Eisch, J.D.; Falcone, A.; Feng, Q.; Fernandez-Alonso, M.; Finley, J.P.; Fleischhack, H.; Flinders, A.; Fortson, L.; Furniss, A.; Gillanders, G.H.; Griffin, S.; Grube, J.; Hütten, M.; Håkansson, N.; Hanna, D.; Hervet, O.; Holder, J.; Hughes, G.; Humensky, T.B.; Johnson, C.A.; Kaaret, P.; Kar, P.; Kelley-Hoskins, N.; Kertzman, M.; Kieda, D.; Krause, M.; Krennrich, F.; Kumar, S.; Lang, M.J.; Maier, G.; McArthur, S.; McCann, A.; Meagher, K.; Moriarty, P.; Mukherjee, R.; Nguyen, T.; Nieto, D.; O'Brien, S.; O'Faoláin de Bhróithe, A.; Ong, R.A.; Otte, A.N.; Park, N.; Petrashyk, A.; Pichel, A.; Pohl, M.; Popkow, A.; Pueschel, E.; Quinn, J.; Ragan, K.; Reynolds, P.T.; Richards, G.T.; Roache, E.; Rovero, A.C.; Rulten, C.; Sadeh, I.; Santander, M.; Sembroski, G.H.; Shahinyan, K.; Telezhinsky, I.; Tucci, J.V.; Tyler, J.; Wakely, S.P.; Weinstein, A.; Wilhelm, A.; Williams, D.A.

doi:10.1093/mnras/stx1756

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Allen, C.; Archambault, S.; Archer, A.; Benbow, W.; Bird, R.; Bourbeau, E.; Brose, R.; Buchovecky, M.; Buckley, J.H.; Bugaev, V.; Cardenzana, J.V.; Cerruti, M.; Chen, X.; Christiansen, J.L.; Connolly, M.P.; Cui, W.; Daniel, M.K.; Eisch, J.D. (...) Williams, D.A. "Very-high-energy γ -ray observations of the Blazar 1ES 2344+514 with VERITAS" (2017) Monthly Notices of the Royal Astronomical Society. 471(2):2117-2123

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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 (χ 2 /NDF = 7.89/6) by a power-law function with an index Γ = 2.46 ± 0.06 stat ± 0.20 sys and extends to at least 8 TeV. The extragalactic-backgroundlight- deabsorbed spectrum is adequately fit (χ 2 /NDF = 6.73/6) by a power-law function with an index Γ = 2.15 ± 0.06 stat ± 0.20 sys while an F-test indicates that the power law with an exponential cut-offfunction 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. © 2017 The Authors.

Registro:

Documento:	Artículo
Título:	Very-high-energy γ -ray observations of the Blazar 1ES 2344+514 with VERITAS
Autor:	Allen, C.; Archambault, S.; Archer, A.; Benbow, W.; Bird, R.; Bourbeau, E.; Brose, R.; Buchovecky, M.; Buckley, J.H.; Bugaev, V.; Cardenzana, J.V.; Cerruti, M.; Chen, X.; Christiansen, J.L.; Connolly, M.P.; Cui, W.; Daniel, M.K.; Eisch, J.D.; Falcone, A.; Feng, Q.; Fernandez-Alonso, M.; Finley, J.P.; Fleischhack, H.; Flinders, A.; Fortson, L.; Furniss, A.; Gillanders, G.H.; Griffin, S.; Grube, J.; Hütten, M.; Håkansson, N.; Hanna, D.; Hervet, O.; Holder, J.; Hughes, G.; Humensky, T.B.; Johnson, C.A.; Kaaret, P.; Kar, P.; Kelley-Hoskins, N.; Kertzman, M.; Kieda, D.; Krause, M.; Krennrich, F.; Kumar, S.; Lang, M.J.; Maier, G.; McArthur, S.; McCann, A.; Meagher, K.; Moriarty, P.; Mukherjee, R.; Nguyen, T.; Nieto, D.; O'Brien, S.; O'Faoláin de Bhróithe, A.; Ong, R.A.; Otte, A.N.; Park, N.; Petrashyk, A.; Pichel, A.; Pohl, M.; Popkow, A.; Pueschel, E.; Quinn, J.; Ragan, K.; Reynolds, P.T.; Richards, G.T.; Roache, E.; Rovero, A.C.; Rulten, C.; Sadeh, I.; Santander, M.; Sembroski, G.H.; Shahinyan, K.; Telezhinsky, I.; Tucci, J.V.; Tyler, J.; Wakely, S.P.; Weinstein, A.; Wilhelm, A.; Williams, D.A.
Filiación:	Physics Department, California Polytechnic State University, San Luis Obispo, CA 94307, United States Physics Department, McGill University, Montreal, QC H3A 2T8, Canada Department of Physics, Washington University, St. Louis, MO 63130, United States Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645, United States Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, United States Institute of Physics and Astronomy, University of Potsdam, Potsdam-Golm, D-14476, Germany DESY, Platanenallee 6, Zeuthen, D-15738, Germany Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States School of Physics, National University of Ireland Galway, University Road, Galway, Ireland Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, United States Department of Physics and Center for Astrophysics, Tsinghua University, Beijing, 100084, China Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, United States Instituto de Astronomia y Fisica del Espacio, C1428ZAA, Ciudad Aut Ãşnoma de Buenos Aires, Casilla de Correo 67-Sucursal 28, Buenos Aires, 1428, Argentina Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, United States School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, United States Department of Physics, California State University-East Bay, Hayward, CA 94542, United States Department of Physics, Stevens Institute of Technology, Hoboken, NJ 07030, United States Santa Cruz Institute for Particle Physics, Department of Physics, University of California, Santa Cruz, CA 95064, United States Department of Physics and Astronomy, Bartol Research Institute, University of Delaware, Newark, DE 19716, United States Physics Department, Columbia University, New York, NY 10027, United States Department of Physics and Astronomy, University of Iowa, Van Allen Hall, Iowa City, IA 52242, United States Department of Physics and Astronomy, DePauw University, Greencastle, IN 46135-0037, United States School of Physics and Center for Relativistic Astrophysics, Georgia Institute of Technology, 837 State Street NW, Atlanta, GA 30332-0430, United States Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027, United States School of Physics, University College Dublin, Belfield, Dublin 4, Ireland Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, United States Department of Physical Sciences, Cork Institute of Technology, Bishopstown, Cork, Ireland
Palabras clave:	Astroparticle physics; BL Lacertae objects: individual: 1ES 2344+514 = VER J2347+517; Gamma-rays: galaxies
Año:	2017
Volumen:	471
Número:	2
Página de inicio:	2117
Página de fin:	2123
DOI:	http://dx.doi.org/10.1093/mnras/stx1756
Título revista:	Monthly Notices of the Royal Astronomical Society
Título revista abreviado:	Mon. Not. R. Astron. Soc.
ISSN:	00358711
CODEN:	MNRAA
Registro:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v471_n2_p2117_Allen

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Citas:

---------- APA ----------

Allen, C., Archambault, S., Archer, A., Benbow, W., Bird, R., Bourbeau, E., Brose, R.,..., Williams, D.A. (2017) . Very-high-energy γ -ray observations of the Blazar 1ES 2344+514 with VERITAS. Monthly Notices of the Royal Astronomical Society, 471(2), 2117-2123.
http://dx.doi.org/10.1093/mnras/stx1756

---------- CHICAGO ----------

Allen, C., Archambault, S., Archer, A., Benbow, W., Bird, R., Bourbeau, E., et al. "Very-high-energy γ -ray observations of the Blazar 1ES 2344+514 with VERITAS" . Monthly Notices of the Royal Astronomical Society 471, no. 2 (2017) : 2117-2123.
http://dx.doi.org/10.1093/mnras/stx1756

---------- MLA ----------

Allen, C., Archambault, S., Archer, A., Benbow, W., Bird, R., Bourbeau, E., et al. "Very-high-energy γ -ray observations of the Blazar 1ES 2344+514 with VERITAS" . Monthly Notices of the Royal Astronomical Society, vol. 471, no. 2, 2017, pp. 2117-2123.
http://dx.doi.org/10.1093/mnras/stx1756

---------- VANCOUVER ----------

Allen, C., Archambault, S., Archer, A., Benbow, W., Bird, R., Bourbeau, E., et al. Very-high-energy γ -ray observations of the Blazar 1ES 2344+514 with VERITAS. Mon. Not. R. Astron. Soc. 2017;471(2):2117-2123.
http://dx.doi.org/10.1093/mnras/stx1756