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arXiv 0907.1942astro-ph.CO
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用混响映射数据诊断AGN宽线区的结构:二分量宽线区模型的确认

Diagnostics of the structure of AGN's broad line regions with reverberation mapping data: confirmation of the two-component broad line region model

Ling Zhu, Shuang Nan Zhang

摘要:

我们重新检查的混响映射(RM)源与公共数据的基础上的宽线区(BLR)的两个组件模型。在拟合它们的宽H-β线时,其中六个只需要一个高斯分量,其中一个具有双峰轮廓,一个具有不规则轮廓,并且其中只有两个需要两个分量,即,甚宽高斯分量(VBGC)和中间高斯分量(IMGC)。在双组分模型中,假设高斯分量来自两个不同的区域;它们是甚宽线区域(VBLR)和中间线区域(IMLR)。两个具有双组分分布的源是Mrk 509和NGC 4051。两个源的两个分量的时滞满足$t_{IMLR}/t_{VBLR}=V^2_{VBLR}/V^2_{IMLR}$,其中$t_{IMLR}$和$t_{VBLR}$是两个分量的时滞,$V_{IMLR}$和$V_{VBLR}$是两个区域的平均气体速度,支持活动星系核(AGN)BLR的两分量模型.这十个源中的大多数只有VBGC的事实证实了RM主要测量VBLR半径的假设;因此,从R-L关系获得的半径主要代表VBLR半径。此外,NGC 4051在单组分模型中滞后约5天,是R-L关系的异常值,如Kaspi等人(2005)所示;然而,这个问题在我们的双组分模型中消失,VBGC和IMGC分别滞后约2天和6天。

英文摘要:

We re-examine the ten Reverberation Mapping (RM) sources with public data based on the two-component model of the Broad Line Region (BLR). In fitting their broad H-beta lines, six of them only need one Gaussian component, one of them has a double-peak profile, one has an irregular profile, and only two of them need two components, i.e., a Very Broad Gaussian Component (VBGC) and an Inter-Mediate Gaussian Component (IMGC). The Gaussian components are assumed to come from two distinct regions in the two-component model; they are Very Broad Line Region (VBLR) and Inter-Mediate Line region (IMLR). The two sources with a two-component profile are Mrk 509 and NGC 4051. The time lags of the two components of both sources satisfy $t_{IMLR}/t_{VBLR}=V^2_{VBLR}/V^2_{IMLR}$, where $t_{IMLR}$ and $t_{VBLR}$ are the lags of the two components while $V_{IMLR}$ and $V_{VBLR}$ represent the mean gas velocities of the two regions, supporting the two-component model of the BLR of Active Galactic Nuclei (AGN). The fact that most of these ten sources only have the VBGC confirms the assumption that RM mainly measures the radius of the VBLR; consequently, the radius obtained from the R-L relationship mainly represent the radius of VBLR. Moreover, NGC 4051, with a lag of about 5 days in the one component model, is an outlier on the R-L relationship as shown in Kaspi et al. (2005); however this problem disappears in our two-component model with lags of about 2 and 6 days for the VBGC and IMGC, respectively.

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