Locating positions of gamma-ray-emitting regions in blazars
Liu, HT; Bai, JM; Wang, JM; Wang JM(王建民)
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2011
卷号414期号:1页码:#REF!
关键词galaxies: active galaxies: jets quasars: emission lines quasars: individual: 3C 273 radio continuum: galaxies
学科分类Astronomy & Astrophysics
DOI10.1111/j.1365-2966.2011.18347.x
通讯作者Liu, HT (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
文章类型Article
英文摘要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.
类目[WOS]Astronomy & Astrophysics
收录类别SCI
WOS记录号WOS:000292141600031
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被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/226549
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
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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):#REF!.
APA Liu, HT,Bai, JM,Wang, JM,&王建民.(2011).Locating positions of gamma-ray-emitting regions in blazars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,414(1),#REF!.
MLA Liu, HT,et al."Locating positions of gamma-ray-emitting regions in blazars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 414.1(2011):#REF!.
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