Discovery of Very-high-energy Emission from RGB J2243+203 and Derivation of Its Redshift Upper Limit
| Autor: | D. Staszak, Daniel Nieto, M. J. Lang, Marcos Santander, Moritz Hütten, M. P. Connolly, Anushka Udara Abeysekara, M. Buchovecky, N. Kelley-Hoskins, Sinéad M. Griffin, David A. Williams, John L. Quinn, P. Moriarty, R. A. Ong, Q. Feng, Ralph Bird, J. Grube, I. Telezhinsky, Wystan Benbow, M. Kertzman, Lucy Fortson, Maria Krause, M. Poh, P. Wilcox, E. Roache, A. Archer, P. T. Reynolds, Gordon T. Richards, A. N. Otte, J. Tyler, J. H. Buckley, F. Krennrich, Jamie Holder, A. Wilhelm, S. McArthur, V. Bugaev, O. Hervet, O. M. Weiner, Henrike Fleischhack, P. Kaaret, David Kieda, V. V. Vassiliev, Abraham D. Falcone, Karlen Shahinyan, A. Weinstein, J. P. Finley, Matteo Cerruti, Amy Furniss, N. H. Park, Gernot Maier, S. P. Wakely, C. A. Johnson, G. H. Gillanders, E. Puesche, B. Zitzer, K. Ragan, S. Kumar, T. B. Humensky, A. Popkow, I. Sadeh, S. Archambault, S. O'Brien, R. Mukherjee, D. S. Hanna, G. H. Sembroski, Robert Brose, C. Rulten, A. Petrashyk, P. Kar, Wei Cui |
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| Rok vydání: | 2017 |
| Předmět: |
extragalactic background light
catalog Photon Astrophysics::High Energy Astrophysical Phenomena blazars FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics telescope 01 natural sciences Power law bl lacertae objects galaxies: individual (rgb j2243+203) 0103 physical sciences Blazar Electronic band structure 010303 astronomy & astrophysics parameters High Energy Astrophysical Phenomena (astro-ph.HE) Physics Spectral index 010308 nuclear & particles physics Institut für Physik und Astronomie Astronomy and Astrophysics Cherenkov Telescope Array Redshift Space and Planetary Science ddc:520 Astrophysics - High Energy Astrophysical Phenomena Fermi Gamma-ray Space Telescope |
| Zdroj: | The astrophysical journal / Supplement series 233(1), 7 (2017). doi:10.3847/1538-4365/aa8d76 |
| ISSN: | 1538-4365 |
| DOI: | 10.3847/1538-4365/aa8d76 |
| Popis: | Very-high-energy (VHE; $>$ 100 GeV) gamma-ray emission from the blazar RGB J2243+203 was discovered with the VERITAS Cherenkov telescope array, during the period between 21 and 24 December 2014. The VERITAS energy spectrum from this source can be fit by a power law with a photon index of $4.6 \pm 0.5$, and a flux normalization at 0.15 TeV of $(6.3 \pm 1.1) \times 10^{-10} ~ \textrm{cm}^{-2} \textrm{s}^{-1} \textrm{TeV}^{-1}$. The integrated \textit{Fermi}-LAT flux from 1 GeV to 100 GeV during the VERITAS detection is $(4.1 \pm 0.8) \times 10^{\textrm{-8}} ~\textrm{cm}^{\textrm{-2}}\textrm{s}^{\textrm{-1}}$, which is an order of magnitude larger than the four-year-averaged flux in the same energy range reported in the 3FGL catalog, ($4.0 \pm 0.1 \times 10^{\textrm{-9}} ~ \textrm{cm}^{\textrm{-2}}\textrm{s}^{\textrm{-1}}$). The detection with VERITAS triggered observations in the X-ray band with the \textit{Swift}-XRT. However, due to scheduling constraints \textit{Swift}-XRT observations were performed 67 hours after the VERITAS detection, not simultaneous with the VERITAS observations. The observed X-ray energy spectrum between 2 keV and 10 keV can be fitted with a power-law with a spectral index of $2.7 \pm 0.2$, and the integrated photon flux in the same energy band is $(3.6 \pm 0.6) \times 10^{-13} ~\textrm{cm}^{-2} \textrm{s}^{-1}$. EBL model-dependent upper limits of the blazar redshift have been derived. Depending on the EBL model used, the upper limit varies in the range from z $ |
| Databáze: | OpenAIRE |
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