| Locating positions of gamma-ray-emitting regions in blazars | |
Liu HT(刘洪涛)1,2 ; Bai JM(白金明)1,2; Wang, JM3,4; Liu, HT (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
| |
| 发表期刊 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 2011-06 | |
| 卷号 | 414期号:1页码:155-166 |
| DOI | 10.1111/j.1365-2966.2011.18347.x |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Galaxies: Active Galaxies: Jets Quasars: Emission Lines Quasars: Individual: 3c 273 Radio Continuum: Galaxies |
| 摘要 | We propose a new method to locate the gamma-ray-emitting positions R gamma from the measured time lags tau(ob) of gamma-ray emission relative to broad emission lines. The method is also applicable to lower frequencies. R-gamma depends on parameters tau(ob), R-BLR, upsilon(d) and theta, where R-BLR is the size of the broad-line region, upsilon(d) is the travelling speed of disturbances down the jet and theta is the viewing angle of the jet axis to the line of sight. As tau(ob) = 0, tau(ob) < 0 or tau(ob) > 0, the broad lines zero-lag, lag or lead the gamma-rays, respectively. It is applied to 3C 273, in which the lines and the radio emission have enough data, but the gamma-rays do not. We find tau(ob) < 0 and tau(ob) > 0 for the 5, 8, 15, 22 and 37 GHz emission relative to the broad lines H alpha, H beta and H gamma. The lag may be positive or negative; however, current data do not allow discrimination between the two cases. The measured lags are of the order of years. For a given line, tau(ob) generally decreases as radio frequency increases. This trend most likely results from the radiative cooling of relativistic electrons. The negative lags have an average of tau(ob)= -2.86 yr for the 37 GHz emission, which represents the lines lagging the radio emission. The positive lags have tau(ob) = 3.20 yr, which represents the lines leading the radio emission. We obtain the radio-emitting positions R-radio = 0.40-2.62 pc and R-radio = 9.43-62.31 pc for the negative and positive lags, respectively. From the constraint of R-gamma less than or similar to R-radio, we have R-gamma less than or similar to 0.40-2.62 pc for the negative lags. For the positive lags, 4.67-30.81 < R-gamma less than or similar to 9.43-62.31 pc. These estimated R-gamma are consistent with those of other studies. These agreements confirm the reliability of the method and assumptions. The method may also be applicable to BL Lacertae objects, in which broad lines were detected. |
| 项目资助者 | West Light Foundation of the CAS ; National Natural Science Foundation of China (NSFC) [10903025, 10973034, 10778702, 10733010] ; 973 Program [2009CB824800] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0035-8711 |
| URL | 查看原文 |
| 归档日期 | 2011-06-21 |
| WOS记录号 | WOS:000292141600031 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | ACTIVE GALACTIC NUCLEI ; BROAD-LINE REGION ; RADIO-LOUD QUASARS ; FERMI-DETECTED BLAZARS ; DEPENDENT TIME-DELAYS ; LARGE-AREA TELESCOPE ; BLACK-HOLE ROTATION ; 3C 273 ; X-RAY ; MULTIWAVELENGTH OBSERVATIONS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/5408 |
| 专题 | 南方基地 |
| 通讯作者 | Liu, HT (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, Yunnan 650011, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, Yunnan 650011, China 3.Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, China 4.Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049, 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 | Liu HT,Bai JM,Wang, JM,et al. Locating positions of gamma-ray-emitting regions in blazars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,414(1):155-166. |
| APA | Liu HT,Bai JM,Wang, JM,&Liu, HT .(2011).Locating positions of gamma-ray-emitting regions in blazars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,414(1),155-166. |
| MLA | Liu HT,et al."Locating positions of gamma-ray-emitting regions in blazars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 414.1(2011):155-166. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| Locating positions o（1928KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论