arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1409.7312astro-ph.GA
收藏

宽线区的尘埃起源和AGN统一方案的模式结果

The dust origin of the Broad Line Region and the model consequences for AGN unification scheme

Bozena Czerny, Justyna Modzelewska, Francesco Petrogalli, Wojtek Pych, Tek P. Adhikari, Piotr T. Zycki, Krzysztof Hryniewicz, Magdalena Krupa, Agnieszka Kurcz, Marek Nikolajuk

摘要:

我们提出了一个非常简单的物理机制,负责在活动星系核宽线区的低电离线部分的形成。它解释了宽线区域的大小与单色光度的缩放,包括精确的斜率和比例常数,在附近源的混响研究中看到。标度与活动核的质量和吸积率无关。该机制预测形成的尘埃驱动的风在磁盘区域的非照明吸积盘的局部有效温度下降到1000 K以下,并允许尘埃形成。我们现在探索该模型的预测能力,目的是区分该模型和以前提出的宽线区形成机制。我们讨论了在长波长下对普适标度的预期偏离,以及源中吸积盘倾角的作用。我们用SALT望远镜观测到的类星体中的Mg Ⅱ谱线轮廓与预期的谱线轮廓进行了比较。我们还讨论了基于低光度活动星系中宽发射线的存在与否的检验。最后,我们讨论了未来的测试模型进行预期的地面观测和卫星任务。

英文摘要:

We propose a very simple physical mechanism responsible for the formation of the Low Ionization Line part of the Broad Line Region in Active Galactic Nuclei. It explains the scaling of the Broad Line Region size with the monochromatic luminosity, including the exact slope and the proportionality constant, seen in the reverberation studies of nearby sources. The scaling is independent from the mass and accretion rate of an active nucleus. The mechanism predicts the formation of a dust-driven wind in the disk region where the local effective temperature of a non-illuminated accretion disk drops below 1000 K and allows for dust formation. We explore now the predictive power of the model with the aim to differentiate between this model and the previously proposed mechanisms of the formation of the Broad Line Region. We discuss the expected departures from the universal scaling at long wavelength, and the role of the inclination angle of the accretion disk in the source. We compare the expected line profiles with Mg II line profiles in the quasars observed by us with the SALT telescope. We also discuss the tests based on the presence or absence of the broad emission lines in low luminosity active galaxies. Finally, we discuss the future tests of the model to be done with expected ground-based observations and satellite missions.

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。

↑