Multi-wavelength emission from 3C 66A： clues to its redshift and gamma-ray emission location

The quasi-simultaneous multi-wavelength emission of TeV blazar 3C 66A is studied by using a one-zone multi-component leptonic jet model. It is found that the quasi-simultaneous spectral energy distribution of 3C 66A can be well reproduced; in particular, the first three months of its average Fermi-L...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2013-04, Vol.13 (4), p.411-419
Main Authors: Yan, Da-Hai, Fan, Zhong-Hui, Zhou, Yao, Dai, Ben-Zhong
Format: Article
Language:English
Subjects:
Astronomy
Blazars
Emission
Extrapolation
Red shift
Spectra
Spectral emissivity
Spectral energy distribution
伽玛射线
位置
光谱红移
光谱能量分布
发射
多波长
射线辐射
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Summary:The quasi-simultaneous multi-wavelength emission of TeV blazar 3C 66A is studied by using a one-zone multi-component leptonic jet model. It is found that the quasi-simultaneous spectral energy distribution of 3C 66A can be well reproduced; in particular, the first three months of its average Fermi-LAT spectrum can be well reproduced by the synchrotron self-Compton component plus external Compton component of the broad line region （BLR）. Clues to its redshift and gamma-ray emission location are obtained. The results indicate the following. （i） On the redshift： The theoretical intrinsic TeV spectra can be predicted by extrapolating the reproduced GeV spectra. Through comparing these extrapolated TeV spectra with the corrected observed TeV spectra from extragalactic background light, it is suggested that the redshift of 3C 66A could be between 0.1 and 0.3, with the most likely value being ~ 0.2. （ii） On the gamma-ray emission location： To well reproduce the GeV emission of 3C 66A under different assumptions on the BLR, the gamma-ray emission region is always required to be beyond the inner zone of the BLR. The BLR absorption effect on gamma-ray emission confirms this point.
ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/13/4/004