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Discovery of Very High Energy Gamma-ray Radiation from the BL Lac 1ES 0806+524 |
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Science Publications
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Written by V. A. Acciari and the VERITAS Collaboration
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Friday, 19 December 2008 |
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The Astrophysical Journal Letters, Volume 690, Issue 2, pp. L126-L129 (2009). arXiv:0812.0978 The high-frequency-peaked BL Lacertae object 1ES 0806+524, at redshift z = 0.138, was observed in the very high energy (VHE) gamma-ray regime by VERITAS between 2006 November and 2008 April. These data encompass the two- and three-telescope commissioning phases, as well as observations with the full four-telescope array. 1ES 0806+524 is detected with a statistical significance of 6.3 standard deviations from 245 excess events. Little or no measurable variability on monthly timescales is found. The photon spectrum for the period 2007 November to 2008 April can be characterized by a power law with photon index 3.6 ± 1.0stat ± 0.3sys between ~ 300 GeV and ~ 700 GeV. The integral flux above 300 GeV is (2.2 ± 0.5stat ± 0.4sys) × 10–12 cm–2 s–1 which corresponds to 1.8% of the Crab Nebula flux. Non-contemporaneous multiwavelength observations are combined with the VHE data to produce a broadband spectral energy distribution that can be reasonably described using a synchrotron--self-Compton model. |
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Last Updated ( Tuesday, 24 February 2009 )
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VERITAS, 1ES 1218 + 30.4 and the Extragalactic Background Light |
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Theses and Dissertations
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Written by Luis Valcarcel
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Tuesday, 11 November 2008 |
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VERITAS, 1ES 1218 + 30.4 and the Extragalactic Background Light Luis Valcrcela Supervisor: Prof. David Hanna McGill University Department of Physics Centre for High-Energy Physics November 2008 |
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Last Updated ( Wednesday, 26 November 2008 )
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Semi-analytical Modelling of Time-variable Blazar Jet Spectra |
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Theses and Dissertations
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Written by Ana Milovanović
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Friday, 31 October 2008 |
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Ana Milovanović Supervisor: Dr. Joachim Rose The University of Leeds School of Physics and Astronomy October 31, 2008
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Last Updated ( Monday, 10 August 2009 )
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Observations of the Crab Nebula and Pulsar with VERITAS |
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Theses and Dissertations
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Written by Ozlem Celik
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Wednesday, 01 October 2008 |
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Observations of the Crab Nebula and Pulsar with VERITAS Ozlem Celik
Supervisor: Prof. Rene Ong University of California, Los Angeles Department of Physics and Astronomy October 2008 |
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Last Updated ( Wednesday, 26 November 2008 )
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VERITAS Discovery of >200 GeV Gamma-Ray Emission from the IBL W Comae |
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Science Publications
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Written by V. A. Acciari and the VERITAS Collaboration
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Wednesday, 10 September 2008 |
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The Astrophysical Journal Letters, 684:L73–L77 ArXiv:0808.0889 We report the detection of very high energy γ-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae ( ) by VERITAS. The source was observed between 2008 January and April. A strong outburst of γ-ray emission was measured in the middle of March, lasting for only 4 days. The energy spectrum measured during the two highest flare nights is fit by a power law and is found to be very steep, with a differential photon spectral index of  . The integral photon flux above  during those two nights corresponds to roughly  of the flux from the Crab Nebula. Quasi-simultaneous Swift observations at X-ray energies were triggered by the VERITAS observations. The spectral energy distribution of the flare data can be described by synchrotron self-Compton (SSC) or external Compton (EC) leptonic jet models. |
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Last Updated ( Thursday, 11 September 2008 )
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