Lick AGN监测项目2011：Markarian 50的混响映射
The Lick AGN Monitoring Project 2011: Reverberation Mapping of Markarian 50
摘要：
Lick AGN监测项目2011年观测活动于2011年春季进行，为期11周。在这里，我们提出的第一个结果，从这个程序，测量的宽线混响滞后的塞弗特1星系Mrk 50。将我们的数据与主要观测活动开始前获得的补充观测结果相结合，我们的数据集涵盖了4.5个月的总持续时间。在此期间，Mrk 50是高度可变的，在U波段连续谱中表现出4倍的最大可变幅度，在H-β谱线中表现出2倍的最大可变幅度。使用标准的互相关技术，我们发现H-β和H-γ分别滞后于V带连续谱τ_cen = 10.64（-0.93，+0.82）和8.43（-1.28，+1.30）天，而He II 4686的滞后尚未解决。的H-β线表现出对称的速度分辨混响签名与较短的滞后，在高速机翼比线的核心，一致的起源在一个广泛的线区域占主导地位的轨道运动，而不是流入或流出。假设维里归一化因子f=5.25，则黑洞质量的维里估计值为（3.2+-0.5）*10^7太阳质量。这些观测结果表明，Mrk 50是最有希望详细研究宽线区域结构和动力学的邻近活动星系之一。
英文摘要：
The Lick AGN Monitoring Project 2011 observing campaign was carried out over the course of 11 weeks in Spring 2011. Here we present the first results from this program, a measurement of the broad-line reverberation lag in the Seyfert 1 galaxy Mrk 50. Combining our data with supplemental observations obtained prior to the start of the main observing campaign, our dataset covers a total duration of 4.5 months. During this time, Mrk 50 was highly variable, exhibiting a maximum variability amplitude of a factor of 4 in the U-band continuum and a factor of 2 in the H-beta line. Using standard cross-correlation techniques, we find that H-beta and H-gamma lag the V-band continuum by tau_cen = 10.64(-0.93,+0.82) and 8.43(-1.28,+1.30) days, respectively, while the lag of He II 4686 is unresolved. The H-beta line exhibits a symmetric velocity-resolved reverberation signature with shorter lags in the high-velocity wings than in the line core, consistent with an origin in a broad-line region dominated by orbital motion rather than infall or outflow. Assuming a virial normalization factor of f=5.25, the virial estimate of the black hole mass is (3.2+-0.5)*10^7 solar masses. These observations demonstrate that Mrk 50 is among the most promising nearby active galaxies for detailed investigations of broad-line region structure and dynamics.
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