Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum-猫眼课题宝

DOI：

10.3847/1538-4357/ab3049

发表时间：

2019-07

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

G. Kriss;G. D. Rosa;J. Ely;B. Peterson;J. Kaastra;M. Mehdipour;G. Ferland;M. Dehghanian;S. Mathur;R. Edelson;K. Korista;N. Arav;A. Barth;M. Bentz;W. Brandt;D. Crenshaw;E. Bontà;K. Denney;C. Done;M. Eracleous;M. Fausnaugh;E. Gardner;M. Goad;C. Grier;K. Horne;C. Kochanek;I. McHardy;H. Netzer;A. Pancoast;L. Pei;R. Pogge;D. Proga;C. Silva;N. Tejos;M. Vestergaard;S. Adams;P. Arévalo;T. Beatty;E. Behar;V. Bennert;S. Bianchi;A. Bigley;S. Bisogni;R. Boissay-Malaquin;G. Borman;M. Bottorff;A. Breeveld;M. Brotherton;J. E. Brown;J. Brown;E. Cackett;G. Canalizo;M. Cappi;M. Carini;K. Clubb;J. Comerford;C. Coker;E. Corsini;E. Costantini;S. Croft;K. Croxall;A. Deason;A. D. Lorenzo-Cáceres;B. Marco;M. Dietrich;L. D. Gesu;J. Ebrero;P. Evans;A. Filippenko;K. Flatland;E. Gates;N. Gehrels;Z. Geier;J. Gelbord;L. Gonzalez;V. Gorjian;D. Grupe;A. Gupta;P. Hall;C. Henderson;S. Hicks;E. Holmbeck;T. Holoien;T. Hutchison;M. Im;J. Jensen;C. Johnson;M. Joner;S. Kaspi;B. Kelly;P. Kelly;J. Kennea;Minjin Kim;Shinyoung Kim;S. Kim;A. King;S. Klimanov;Y. Krongold;M. W. Lau

我们模拟了2014年6个月混响映射活动期间用哈勃太空望远镜获得的塞弗特1星系NGC 5548的紫外光谱。我们的NGC 5548发射模型校正了叠加吸收，并将单个发射线解混。使用模型化的光谱，我们测量的连续变化的解混和吸收校正的个人宽的发射线，速度依赖的配置文件的Lyα和C iv，和窄和宽的固有吸收功能。我们发现，校正后的发射线的时间滞后是可比的原始数据。Lyα和Civ的速度分箱滞后分布具有双峰结构，表明是截短的开普勒盘。窄吸收线显示出对连续变化的延迟响应，对应于密度为105 cm−3的气体中的复合。高电离窄吸收线解相关的连续变化在同一时期的广泛的发射线。分析这些吸收线在此期间的响应表明，相对于远紫外连续谱，电离通量的强度减小。与X射线遮蔽剂相关的宽吸收线在同一时间间隔内强度下降。2012年7月X射线遮蔽的出现与NGC 5548在经历长期低态后亮度的增加相对应。我们认为，模糊是一个磁盘风引发的NGC 5548的增亮后，在前面的低光度状态的宽线区域的大小减少。

We model the ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 obtained with the Hubble Space Telescope during the 6 month reverberation mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption and deblends the individual emission lines. Using the modeled spectra, we measure the response to continuum variations for the deblended and absorption-corrected individual broad emission lines, the velocity-dependent profiles of Lyα and C iv, and the narrow and broad intrinsic absorption features. We find that the time lags for the corrected emission lines are comparable to those for the original data. The velocity-binned lag profiles of Lyα and C iv have a double-peaked structure indicative of a truncated Keplerian disk. The narrow absorption lines show a delayed response to continuum variations corresponding to recombination in gas with a density of ∼105 cm−3. The high-ionization narrow absorption lines decorrelate from continuum variations during the same period as the broad emission lines. Analyzing the response of these absorption lines during this period shows that the ionizing flux is diminished in strength relative to the far-ultraviolet continuum. The broad absorption lines associated with the X-ray obscurer decrease in strength during this same time interval. The appearance of X-ray obscuration in ∼2012 corresponds with an increase in the luminosity of NGC 5548 following an extended low state. We suggest that the obscurer is a disk wind triggered by the brightening of NGC 5548 following the decrease in size of the broad-line region during the preceding low-luminosity state.

Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum

文献摘要

被引文献

相似文献