Spectrum of Very High Energy Gamma‐Rays from the blazar 1ES 1959+650 during Flaring Activity in 2002
| Autor: | M. K. Daniel, H. M. Badran, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter‐Lewis, M. Catanese, O. Celik, P. Cogan, W. Cui, M. D’Vali, I. de la Calle Perez, C. Duke, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. F. Fortson, J. A. Gaidos, S. Gammell, K. Gibbs, G. H. Gillanders, J. Grube, J. Hall, T. A. Hall, D. Hanna, A. M. Hillas, J. Holder, D. Horan, T. B. Humensky, A. Jarvis, M. Jordan, G. E. Kenny, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, M. J. Lang, S. Le Bohec, E. Linton, J. Lloyd‐Evans, A. Milovanovic, P. Moriarty, D. Muller, T. Nagai, S. Nolan, R. A. Ong, R. Pallassini, D. Petry, B. Power‐Mooney, J. Quinn, M. Quinn, K. Ragan, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, A. Syson, V. V. Vassiliev, S. P. Wakely, G. Walker, T. C. Weekes, J. Zweerink |
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| Rok vydání: | 2005 |
| Předmět: |
tev energies
Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics system techniques : spectroscopic law.invention Telescope project law Coincident bl lacertae objects : individual (1es 1959+650) gamma rays : observations strong flares Blazar Cherenkov radiation Physics Spectral index Range (particle radiation) Astrophysics (astro-ph) Gamma ray h1426+428 Astronomy and Astrophysics calibration radiation Space and Planetary Science cherenkov telescopes markarian-421 High Energy Physics::Experiment Flare |
| Zdroj: | Department of Physics and Astronomy Faculty Publications |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/427406 |
| Popis: | The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cherenkov Telescope during May of 2002. A spectral analysis has been carried out on the data from that time period and the resulting very high energy gamma-ray spectrum ($E \geq 316$ GeV) can be well fit by a power-law of differential spectral index \alpha = 2.78 +/- 0.12_{stat.} +/- 0.21_{sys.}. On June 4th 2002, the source flared dramatically in the gamma-ray range without any coincident increase in the X-ray emission, providing the first unambiguous example of an `orphan' gamma-ray flare from a blazar. The gamma-ray spectrum for these data can also be described by a simple power-law fit with \alpha = 2.82 +/- 0.15_{stat.} +/- 0.30_{sys.}. There is no compelling evidence for spectral variability, or for any cut-off to the spectrum. Comment: 25 pages. Collaboration website at http://veritas.sao.arizona.edu/ |
| Databáze: | OpenAIRE |
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