论文标题
HST/COS Spectra揭示的窄线Seyfert 1 Galaxy PG 1001+054中的快速流出的热吸收器
Fast Outflowing Warm Absorbers in Narrow-Line Seyfert 1 Galaxy PG 1001+054 Revealed by HST/COS Spectra
论文作者
论文摘要
狭窄的seyfert 1（NLS1）星系是一种重要类型的活性银河核（AGN），通常期望以高爱丁顿的速率积聚。其流出的特性和AGN反馈的重要性仍然吸引人。我们报告了在NLS1 PG 1001+054中发现快速流出的温暖吸收剂（WAS），速度在每秒7000至9000公里的范围内。它们在高分辨率紫外线（UV）光谱中用蓝光的Lyman Alpha，N V和Si IV线鉴定，并用宇宙起源光谱仪（COS）在Hubble Space望远镜（HST）上识别。我们使用XSTAR使用三个was进行光电离世。在电离和色谱柱密度方面，派生的物理特性是典型的IS，而流出速度明显更高。这些位置的范围是距AGN的1到73个parsec。加上PG 1001+054中X射线中高电离吸收器的先前检测，我们建议快速流出的紫外吸收器可能是多相外流的一部分。这种结构很可能是由AGN在积聚磁盘尺度上发射的流出产生的，这震惊了环境ISM产生分层吸收器。假设这三个贡献是在数十个parsec中，则流出能力和AGN Eddington发光度之间的估计比率可能达到1.7％，与某些理论模型相比，对宿主星系产生了足够影响的可能性，这可能会达到有效的AGN反馈。
Narrow-Line Seyfert 1 (NLS1) Galaxies are an important type of active galactic nucleus (AGN), generally expected to be accreting at high Eddington rate. The properties of their outflows and importance of AGN feedback remain intriguing. We report on the discovery of fast outflowing warm absorbers (WAs) in the NLS1 PG 1001+054, with velocities in the range of 7000 to 9000 kilometers per second. They are identified with blueshifted Lyman alpha, N v and Si iv lines in the high resolution ultraviolet (UV) spectra taken with the Cosmic Origins Spectrograph (COS) onboard the Hubble Space Telescope (HST). We perform photoionization modeling using XSTAR with three WAs. The derived physical properties are typical of WAs in terms of ionization and column density, whereas the outflow velocities are significantly higher. The estimated location of these WAs ranges from 1 to 73 parsecs away from the AGN. Together with previous detection of high ionization absorber in the X-ray for PG 1001+054, we suggest that the fast outflowing UV absorber is probably a part of a multiphase outflow. Such structure is likely produced by the outflow launched from AGN at accretion disk scale, which shocks the ambient ISM producing stratified absorbers. Assuming contribution from the three WAs at tens of parsecs, the estimated ratio between the kinetic power of the outflow and AGN Eddington luminosity could reach 1.7 percent, raising the possibility of sufficient influence on the host galaxy when compared to some theoretical models for efficient AGN feedback.
