开普勒场Seyfert星系Zw 229-015的宽线混响
Broad-Line Reverberation in the Kepler-Field Seyfert Galaxy Zw 229-015
摘要：
塞弗特1星系Zw 229-015是开普勒任务监测的最明亮的活动星系之一。为了从H-β反射映射中确定Zw 229-015中的黑洞质量，我们在2010年6月至12月的暗运行期间使用Lick 3 m望远镜的Kast摄谱仪进行了夜间观测，共获得54次光谱观测。我们还获得了夜间V波段成像与卡茨曼自动成像望远镜在利克天文台和0.9米望远镜在杨百翰大学西山天文台在同一时期。我们检测到强烈的变异性的来源，表现出超过2的因素，在广泛的H-β通量的变化。从互相关测量中，我们发现H β光曲线相对于V波段连续谱变化有3.86（+0.69，-0.90）天的静止帧滞后。我们还测量混响滞后的H-α和H-γ，并找到一个上限的H-δ滞后。将H β滞后测量结果与从均方根变率谱中测得的σ = 1590+/-47 km/s的宽H β宽度相结合，我们得到Zw 229-015中黑洞的维里估计值M_BH = 1.00（-0.24，+0.19）*10^7太阳质量。作为开普勒望远镜的目标，Zw 229-015最终将拥有迄今为止对任何活动星系测量的最高质量的光学光变曲线之一，并且从反射映射确定的黑洞质量将作为测试活动星系核中黑洞质量和连续可变性特征之间关系的基准。
英文摘要：
The Seyfert 1 galaxy Zw 229-015 is among the brightest active galaxies being monitored by the Kepler mission. In order to determine the black hole mass in Zw 229-015 from H-beta reverberation mapping, we have carried out nightly observations with the Kast Spectrograph at the Lick 3m telescope during the dark runs from June through December 2010, obtaining 54 spectroscopic observations in total. We have also obtained nightly V-band imaging with the Katzman Automatic Imaging Telescope at Lick Observatory and with the 0.9m telescope at the Brigham Young University West Mountain Observatory over the same period. We detect strong variability in the source, which exhibited more than a factor of 2 change in broad H-beta flux. From cross-correlation measurements, we find that the H-beta light curve has a rest-frame lag of 3.86(+0.69,-0.90) days with respect to the V-band continuum variations. We also measure reverberation lags for H-alpha and H-gamma and find an upper limit to the H-delta lag. Combining the H-beta lag measurement with a broad H-beta width of sigma = 1590+/-47 km/s measured from the root-mean-square variability spectrum, we obtain a virial estimate of M_BH = 1.00(-0.24,+0.19)*10^7 solar masses for the black hole in Zw 229-015. As a Kepler target, Zw 229-015 will eventually have one of the highest-quality optical light curves ever measured for any active galaxy, and the black hole mass determined from reverberation mapping will serve as a benchmark for testing relationships between black hole mass and continuum variability characteristics in active galactic nuclei.
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