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arXiv 0706.2473astro-ph
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具有双峰巴耳末线的活动星系核:I。黑洞质量与爱丁顿比

Active Galactic Nuclei with Double-Peaked Balmer Lines: I. Black Hole Masses and the Eddington ratios

Wei-Hao Bian, Yan-Mei Chen, Qu-Sheng Gu, Jin-Min Wang

摘要:

使用恒星的人口合成,我们模拟了恒星的贡献,从斯隆数字巡天(SDSS)的110个双峰宽线AGN的样本。对52个具有明显恒星吸收特征的双峰活动星系核(AGN)进行了恒星速度频散($σ_*$)测量,其值从106到284 \kms不等。我们还使用多组分谱来拟合\OIII $λ\lambda4959,5007$和H $β$发射线。使用已建立的$M_{\rm bh}-σ_*$关系,计算出黑洞质量的范围为$1.0\times 10^{7}$至$5.5\times 10^{8}$ $\Msun$,爱丁顿比约为0.01至1。通过与已知的$R_{\rm BLR}-L$关系式的比较,得到了表征BLR几何、倾角和运动学的因子$f$。我们发现,$f$远远偏离0.75,这表明宽线区域的非维里动力学。峰分离与爱丁顿比和SMBH质量轻度相关,相关系数几乎相同。这意味着,很难检测到明显的双峰活动星系核具有较高的爱丁顿比。用5100 nm单色光度跟踪测热光度,发现吸积盘的外部照明是产生H $α$发射线观测强度的必要条件。

英文摘要:

Using the stellar population synthesis, we model the stellar contribution for a sample of 110 double-peaked broad-lines AGNs from the Sloan Digital Sky Survey (SDSS). The stellar velocity dispersions ($σ_*$) are obtained for 52 double-peaked AGNs with obvious stellar absorption features, ranging from 106 to 284 \kms. We also use multi-component profiles to fit \OIII $λ\lambda4959,5007$ and H$β$ emission lines. Using the well-established $M_{\rm bh}-σ_*$ relation, the black hole masses are calculated to range from $1.0\times 10^{7}$ to $5.5\times 10^{8}$ $\Msun$, and the Eddington ratio from about 0.01 to about 1. Comparing with the known $R_{\rm BLR}-L$ relation, we can get the factor $f$, which indicates BLRs' geometry, inclination and kinematics. We find that $f$ far deviates from 0.75, suggesting the non-virial dynamics of broad line regions. The peak separation is mildly correlated with the Eddington ratio and SMBH mass with almost the same correlation coefficients. It implies that it is difficult to detect obvious double-peak AGNs with higher Eddington ratios. Using the monochromatic luminosity at 5100Åto trace the bolometric luminosity, we find that the external illumination of the accretion disk is needed to produce the observed strength of H$α$ emission line.

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