H E ] 2 3 D ec 2 01 3 A Three-Year Multi-Wavelength Study of the Very High Energy γ-ray Blazar 1 ES 0229 + 200
semanticscholar(2018)
摘要
The high-frequency-peaked BL Lacertae object 1ES 0229+200 is a relatively distant (z = 0.1396), hard-spectrum (Γ ∼ 2.5), very-high-energy-emitting (E > 100 GeV) γray blazar. Very-high-energy measurements of this active galactic nucleus have been used to place constraints on the intensity of the extragalactic background light and the intergalactic magnetic field. A multi-wavelength study of this object centered around very-high-energy observations by VERITAS is presented. This study obtained, over a period of three years, an 11.7 standard deviation detection and an average integral flux F (E > 300 GeV) = (23.3±2.8stat±5.8sys)×10 −9 photons m s, or 1.7% of the Crab Nebula’s flux (assuming the Crab Nebula spectrum measured by H.E.S.S). Supporting observations from Swift and RXTE are analyzed. The Swift observations are combined with previously published Fermi observations and the very-high-energy measurements to produce an overall spectral energy distribution which is then modeled assuming onezone synchrotron-self-Compton emission. The χ probability of the TeV flux being constant is 1.6%. This, when considered in combination with measured variability in the X-ray band, and the demonstrated variability of many TeV blazars, suggests that the use of blazars such as 1ES 0229+200 for intergalactic magnetic field studies may not be straightforward and challenges models that attribute hard TeV spectra to secondary γ-ray production along the line of sight. Subject headings: extragalactic — BL Lacertae objects: individual (1ES 0229+200, VERJ0232+202) — gamma-rays: observations
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