Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-11-06
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
submited
Scientific paper
The emission mechanism of TeV blazar 3C 66A is studied employing multi-wavelength observational data. The GeV spectrum observed by \textit{Fermi}-LAT cannot be explained by pure synchrotron self-Compton (SSC) radiation. A multi-component leptonic jet model including the absorption of extragalactic background light reproduces the quasi-simultaneous spectral energy distribution. The external Compton component of the broad line region (BLR) is important for emission above 10 GeV, while emission from 0.1 GeV to 10 GeV is dominated by the SSC component. Our model implies that the redshift of 3C 66A should be between 0.15 and 0.31, the most likely value being 0.21. Our results also indicate that the $\gamma$-ray emission region is beyond the inner zone of BLR. The effects of model parameters and assumptions on the estimating of the redshift are discussed.
Dai Benzhong
Fan Zhonghui
Yan Dahai
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