AI 中文总结
对47个红移2到7的1型AGN样本进行巴尔末吸收普查，考虑数据不完整性，发现LRD中\Has吸收比例及与其他光谱特性的关系，还发现巴尔末吸收速度与[OIII]5007窄线光度相关，确定吸收与辐射驱动外流一致。
AI 中文摘要
第一代詹姆斯·韦布空间望远镜（JWST）巡天的一项显著成果是在$L_{\rm bol} < 10^{45}$~erg~s$^{-1}$范围内发现了大量高红移（$z > 4$）的宽线活动星系核（AGN），此前仅在$z < 1$时可观测到。其宽氢线中吸收特征的高普遍性是这一新群体很大一部分的特性之一。本文对47个红移范围在$2 < z < 7$的1型AGN样本进行了巴尔末吸收的广泛普查。考虑到JWST光谱数据的不完整性，估计44%（误差范围为-6%至+21%）的小红点（LRD）在\Has中有吸收，而小蓝点（LBD）的发生率<25%（2$\sigma$）。此外，R1000 JWST/NIRSpec数据受分辨率严重限制，无法区分吸收中的多普勒展宽和光学深度效应。R270观测缓解了这一问题，不过仍存在一些简并性。我们发现巴尔末吸收速度与[OIII]5007窄线光度之间存在显著相关性，表明存在共同驱动机制。未发现巴尔末吸收与LRD的其他光谱特性之间有任何其他显著相关性（也未证实先前声称的相关性）（除了\Has和\Hbs吸收速度之间的预期相关性）。比较LRD、类星体和恒星\Has吸收体，我们确定LRD和宽吸收线类星体中的吸收都与辐射驱动外流一致，这与变星的物理过程相呼应，但发生在截然不同的尺度上。
英文摘要
A notable achievement of the first generation of JWST surveys was the discovery of an abundance of faint high-redshift ($z > 4$) broad-line active galactic nuclei (AGN) in the $L_{\rm bol} < 10^{45}$~erg~s$^{-1}$ regime, previously only accessible at $z < 1$. The high prevalence of absorption features in their broad hydrogen lines is one of the peculiarities of a significant fraction of this new population. In this paper, we conduct a broad census of Balmer absorption in a sample of 47 Type-1 AGN spanning $2 < z < 7$. Accounting for incompleteness of JWST spectroscopic data, we estimate that $44_{-6}^{+21}$~\% of Little Red Dots (LRDs) have absorption in \Has while the incidence rate is $< 25$~\% (at 2$σ$) in Little Blue Dots (LBDs). Additionally, R1000 JWST/NIRSpec data is strongly resolution limited, implying an inability to disentangle Doppler broadening in the absorption from optical depth effects. This is alleviated with R2700 observations, although some degeneracies remain. We find a significant correlation between the velocity of the Balmer absorption and the [OIII]5007 narrow line luminosity, suggesting a common driving mechanism. We do not find any other significant correlations (and do not confirm previously claimed correlations) between Balmer absorption and other spectral properties of LRDs (except for the expected correlation between \Has and \Hbs absorption velocities). Comparing LRDs, quasars and stellar \Has absorbers, we establish that absorption in both LRDs and broad absorption line quasars is consistent with radiatively driven outflows, echoing the physics of variable stars yet occurring at vastly different scales.
Comments20 pages, 18 figures, submitted to MNRAS, comments welcome
