论文标题
X射线中的超大质黑洞风：地铁。 ii。中间红移的HST紫外线光谱
Supermassive Black Hole Winds in X-rays: SUBWAYS. II. HST UV spectroscopy of winds at intermediate redshifts
论文作者
论文摘要
我们提出了21个活性银河核（AGN）的电离流出流的紫外线光谱研究，该研究与HST观察到。选择了地铁样品的目标，目的是探测局部Seyfert星系和高红移的发光类星体之间未充满激光AGN的参数空间。我们的目标跨越了大型多波长运动，跨越了0.1-0.4的红移和10^45-10^46 erg/s的降射光度（L_BOL）。在这里，我们对紫外光谱进行建模，并寻找不同类型的AGN流出。我们发现60％的靶标显示了流出的H I吸收，而40％的靶标则表现出电离流出的流出，被C IV，N V或O VI视为吸收。这与在局部塞弗特星系中看到的电离流出流的发生相媲美。样品中的所有紫外吸收线都相对狭窄，流出速度达到-3300 km/s。我们没有发现与X射线超快速流出（UFO）的任何紫外线对应物，这很可能是由于它们太高离子化。但是，所有具有X射线UFO的地铁目标都证明了较低速度的紫外线流出。我们发现紫外离子的柱密度（n）与agn的l_bol之间的显着相关性，而h i的n随l_bol降低，而o vi的n随着l_bol的增加而增加。这可能是一种光电离效应，在较高的AGN亮度下，风变得更具电离，导致中性或低离子化离子的吸收较少，高离子离子吸收更多。此外，我们发现n紫外离子的流出速度增加而减小。这可以通过撤离紫外线吸收介质的机械能力来解释。我们观察到的关系与多相AGN进食和反馈模拟一致，这表明辐射和机械过程的组合正在发挥作用。
We present a UV spectroscopic study of ionized outflows in 21 active galactic nuclei (AGN), observed with the HST. The targets of the SUBWAYS sample were selected with the aim to probe the parameter space of the underexplored AGN between the local Seyfert galaxies and the luminous quasars at high redshifts. Our targets, spanning redshifts of 0.1-0.4 and bolometric luminosities (L_bol) of 10^45-10^46 erg/s, have been observed with a large multi-wavelength campaign. Here, we model the UV spectra and look for different types of AGN outflows. We find that 60% of our targets show a presence of outflowing H I absorption, while 40% exhibit ionized outflows seen as absorption by either C IV, N V, or O VI. This is comparable to the occurrence of ionized outflows seen in the local Seyfert galaxies. All UV absorption lines in the sample are relatively narrow, with outflow velocities reaching up to -3300 km/s. We did not detect any UV counterparts to the X-ray ultra-fast outflows (UFOs), most likely due to their being too highly ionized. However, all SUBWAYS targets with an X-ray UFO demonstrate the presence of UV outflows at lower velocities. We find significant correlations between the column density (N) of the UV ions and L_bol of the AGN, with N of H I decreasing with L_bol, while N of O VI is increasing with L_bol. This is likely to be a photoionization effect, where toward higher AGN luminosities, the wind becomes more ionized, resulting in less absorption by neutral or low-ionization ions and more absorption by high-ionization ions. In addition, we find that N of the UV ions decreases as their outflow velocity increases. This may be explained by a mechanical power that is evacuating the UV-absorbing medium. Our observed relations are consistent with multiphase AGN feeding and feedback simulations indicating that a combination of both radiative and mechanical processes are in play.
