arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.01146astro-ph.GA
收藏

Lick AGN监测项目2011:光谱活动和发射线光变曲线

The Lick AGN Monitoring Project 2011: Spectroscopic Campaign and Emission-Line Light Curves

A. J. Barth, V. N. Bennert, G. Canalizo, A. V. Filippenko, E. L. Gates, J. E. Greene, W. Li, M. A. Malkan, A. Pancoast, D. J. Sand, D. Stern, T. Treu, J. -H. Wo… 展开作者

A. J. Barth, V. N. Bennert, G. Canalizo, A. V. Filippenko, E. L. Gates, J. E. Greene, W. Li, M. A. Malkan, A. Pancoast, D. J. Sand, D. Stern, T. Treu, J. -H. Woo, R. J. Assef, H. -J. Bae, B. J. Brewer, S. B. Cenko, K. I. Clubb, M. C. Cooper, A. M. Diamond-Stanic, K. D. Hiner, S. F. Hoenig, E. Hsiao, M. T. Kandrashoff, M. S. Lazarova, A. M. Nierenberg, J. Rex, J. M. Silverman, E. J. Tollerud, J. L. Walsh

摘要:

在2011年春天,我们进行了为期2.5个月的混响映射活动,使用3米沙恩望远镜在利克天文台,监测15个低红移塞弗特1星系。本文介绍了观测,减少和测量,和数据产品的光谱活动。简化的光谱与多组分模型拟合,以隔离各种连续谱和发射线组分的贡献。我们目前的光变曲线的宽发射线和活动星系核的连续,和测量的宽H-β线宽的平均值和均方根(rms)光谱。对于变化最大的活动星系核,我们还测量了宽的H-β线宽和速度质心的夜间光谱。在四个活动星系核表现出最高的变化幅度,我们检测到广泛的H-β宽度和光度之间的关系,表明宽线区域“呼吸”在短时间尺度的天到几周的连续变化。我们还发现,广泛的H-β速度质心可以发生重大变化,以响应连续变化;在NGC 4593中,广泛的H-β速度移动了约250公里/秒超过一个月的时间。这种混响引起的速度漂移效应很可能是一个重要的混淆噪声源的二进制黑洞搜索,使用多历元类星体光谱检测二进制轨道运动。我们还提出了模拟结果,检查偏差,可以发生在测量宽线宽的均方根光谱由于连续变化和光子计数噪声的贡献。

英文摘要:

In the Spring of 2011 we carried out a 2.5 month reverberation mapping campaign using the 3 m Shane telescope at Lick Observatory, monitoring 15 low-redshift Seyfert 1 galaxies. This paper describes the observations, reductions and measurements, and data products from the spectroscopic campaign. The reduced spectra were fitted with a multicomponent model in order to isolate the contributions of various continuum and emission-line components. We present light curves of broad emission lines and the AGN continuum, and measurements of the broad H-beta line widths in mean and root-mean square (rms) spectra. For the most highly variable AGNs we also measured broad H-beta line widths and velocity centroids from the nightly spectra. In four AGNs exhibiting the highest variability amplitudes, we detect anticorrelations between broad H-beta width and luminosity, demonstrating that the broad-line region "breathes" on short timescales of days to weeks in response to continuum variations. We also find that broad H-beta velocity centroids can undergo substantial changes in response to continuum variations; in NGC 4593 the broad H-beta velocity shifted by ~250 km/s over a one-month duration. This reverberation-induced velocity shift effect is likely to contribute a significant source of confusion noise to binary black hole searches that use multi-epoch quasar spectroscopy to detect binary orbital motion. We also present results from simulations that examine biases that can occur in measurement of broad-line widths from rms spectra due to the contributions of continuum variations and photon-counting noise.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑