| A synchrotron self-Compton scenario for the very high energy gamma-ray emission of the intermediate BL Lacertae object W Comae | |
Zhang J(张晋)1,2 ; Zhang, J (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
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| 发表期刊 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 2009-07 | |
| 卷号 | 9期号:7页码:777-782 |
| DOI | 10.1088/1674-4527/9/9/002 |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Bl Lacertae Objects: Individual: w Comae Gamma-rays: Observations Gamma-rays: Theory Radiation Mechanisms: Non-thermal |
| 摘要 | W Comae has significant variability in multi-wavelengthes, from radio to gamma-ray bands. A bright outburst in optical and X-ray bands was observed in 1998, and most recently, a strong TeV flare was detected by VERITAS in 2008. It is the first TeV intermediate-frequency-peaked BL Lacertae source. I find that both the broadband spectral energy distributions (SEDs) which were quasi-simultaneously obtained during the TeV flare and during the optical/X-ray outburst are well fit by using a single-zone synchrotron + synchrotron-self-Compton model. The satisfactory fitting requires a large beaming factor, i.e., delta similar to 25 and delta similar to 20 for the TeV flare and the optical/X-ray outburst, respectively, suggesting that both the optical/X-ray outburst and the TeV flare are from a relativistic jet. The size of the emission region of the TeV flare is three times larger than that of the optical/X-ray outburst, and the strength of the magnetic field for the TeV flare is similar to 14 times smaller than that of the X-ray/optical outburst, likely indicating that the region of the TeV flare is more distant from the core than that of the X-ray/optical outburst. The inverse Compton component of the TeV flare peaks around 1.3 GeV, but it is around 20 MeV for the X-ray/optical outburst, lower than that for the TeV flare by two orders of magnitude. The model predicts that the optical/X-ray outburst might be accompanied by a strong MeV/GeV emission, but the TeV flare may be not associated with the X-ray/optical outburst. The GeV emission is critical for characterizing the SEDs of the optical/X-ray outburst and the TeV flare. The predicted GeV flux is above the sensitivity of Fermi/LAT, and it could be verified with the observations by Fermi/LAT in the near future. |
| 项目资助者 | National Natural Science Foundation of China [10533050] ; National Basic Research Program ("973" Program) of China [2009CB824800] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 1674-4527 |
| URL | 查看原文 |
| 归档日期 | 2009-06-15 |
| WOS记录号 | WOS:000268130300006 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | EXTRAGALACTIC RADIO-SOURCES ; ACTIVE GALACTIC NUCLEI ; EGRET OBSERVATIONS ; BLAZARS ; RADIATION ; SPECTRA ; MODEL ; JET ; CONSTRAINTS ; VARIABILITY |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4981 |
| 专题 | 高能天体物理研究组 |
| 通讯作者 | Zhang, J (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China |
| 第一作者单位 | 中国科学院云南天文台 |
| 推荐引用方式 GB/T 7714 | Zhang J,Zhang, J . A synchrotron self-Compton scenario for the very high energy gamma-ray emission of the intermediate BL Lacertae object W Comae[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(7):777-782. |
| APA | Zhang J,&Zhang, J .(2009).A synchrotron self-Compton scenario for the very high energy gamma-ray emission of the intermediate BL Lacertae object W Comae.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(7),777-782. |
| MLA | Zhang J,et al."A synchrotron self-Compton scenario for the very high energy gamma-ray emission of the intermediate BL Lacertae object W Comae".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.7(2009):777-782. |
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