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

被引：1

作者：

Da-Hai Yan ^{[1
]}

Zhong-Hui Fan ^{[1
]}

Yao Zhou ^{[1
]}

Ben-Zhong Dai ^{[1
]}

机构：

[1] Department of Physics,Yunnan University

来源：

Research in Astronomy and Astrophysics | 2013年 / 13卷 / 04期

基金：

美国国家科学基金会;

关键词：

BL Lacertae objects: individual (3C 66A)—galaxies: active—gamma-rays: theory—radiation mechanisms: non-thermal;

D O I：

暂无

中图分类号：

P172.3 [γ射线天文学];

学科分类号：

070401 ;

摘要：

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.

引用

页码：411 / 419

页数：9

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