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Lick AGN监测计划:来自β混响映射的宽线区域半径和黑洞质量

The Lick AGN Monitoring Project: Broad-Line Region Radii and Black Hole Masses from Reverberation Mapping of Hbeta

Misty C. Bentz, Jonelle L. Walsh, Aaron J. Barth, Nairn Baliber, Nicola Bennert, Gabriela Canalizo, Alexei V. Filippenko, Mohan Ganeshalingam, Elinor L. Gates, … 展开作者

Misty C. Bentz, Jonelle L. Walsh, Aaron J. Barth, Nairn Baliber, Nicola Bennert, Gabriela Canalizo, Alexei V. Filippenko, Mohan Ganeshalingam, Elinor L. Gates, Jenny E. Greene, Marton G. Hidas, Kyle D. Hiner, Nicholas Lee, Weidong Li, Matthew A. Malkan, Takeo Minezaki, Yu Sakata, Frank J. D. Serduke, Jeffrey M. Silverman, Thea N. Steele, Daniel Stern, Rachel A. Street, Carol E. Thornton, Tommaso Treu, Xiaofeng Wang, Jong-Hak Woo, Yuzuru Yoshii

摘要:

我们最近在利克天文台3米沙恩望远镜上完成了一项为期64晚的光谱监测活动,目的是测量附近12个(z < 0.05)塞弗特1星系中黑洞的质量,这些星系的预期质量在~10^6-10^7太阳质量范围内,同时也测量了附近经过充分研究的活动星系核(AGN)NGC 5548。样本中的9个物体(包括NGC 5548)在监测活动期间显示出足够强度的光学可变性,以便在连续波动和对宽β发射中这些波动的响应之间测量时间滞后。我们在这里展示了这个样本中物体的光变曲线,以及随后的9个物体的Hbeta时间滞后,其中这些测量是可能的。Hbeta滞后时间与宽线区域的大小直接相关,结合Hbeta发射谱可变部分的宽度,我们确定了这9个活动星系核中心超大质量黑洞的维里质量.绝对校准的黑洞质量的基础上,由Onken等人导出的归一化。我们还研究了作为速度的函数的时滞响应在六个活动星系核的Hbeta线轮廓。四个的分析导致模糊的结果,相对平坦的时间滞后作为速度的函数。然而,SBS 1116+ 583 A表现出对称的时间滞后响应线中心周围的圆轨道宽线区(BLR)云的简单模型,和Arp 151显示了一个不对称的配置文件,这是最容易解释的一个简单的重力下降模型。进一步的调查将是必要的,以充分了解的限制放在物理模型的BLR的速度分辨响应在这些对象。

英文摘要:

We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with the aim of measuring the masses of the black holes in 12 nearby (z < 0.05) Seyfert 1 galaxies with expected masses in the range ~10^6-10^7 M_sun and also the well-studied nearby active galactic nucleus (AGN) NGC 5548. Nine of the objects in the sample (including NGC 5548) showed optical variability of sufficient strength during the monitoring campaign to allow for a time lag to be measured between the continuum fluctuations and the response to these fluctuations in the broad Hbeta emission. We present here the light curves for the objects in this sample and the subsequent Hbeta time lags for the nine objects where these measurements were possible. The Hbeta lag time is directly related to the size of the broad-line region, and by combining the lag time with the measured width of the Hbeta emission line in the variable part of the spectrum, we determine the virial mass of the central supermassive black hole in these nine AGNs. The absolute calibration of the black hole masses is based on the normalization derived by Onken et al. We also examine the time lag response as a function of velocity across the Hbeta line profile for six of the AGNs. The analysis of four leads to ambiguous results with relatively flat time lags as a function of velocity. However, SBS 1116+583A exhibits a symmetric time lag response around the line center reminiscent of simple models for circularly orbiting broad-line region (BLR) clouds, and Arp 151 shows an asymmetric profile that is most easily explained by a simple gravitational infall model. Further investigation will be necessary to fully understand the constraints placed on physical models of the BLR by the velocity-resolved response in these objects.

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