标题： 红移约为 z ~ 2-3 的紫外选样本活动星系核的静止框架紫外光谱 显示英文标题

标题： The Rest Frame Ultraviolet Spectra of UV-Selected Active Galactic Nuclei at z ~ 2-3

摘要： 我们展示了针对一个包含33个窄线UV选择活动星系核（AGN）样本的新结果，这些AGN是在z ~ 2-3的恒星形成星系光谱巡天过程中识别出来的。 我们的AGN样本的帧间UV合成光谱显示出几个典型的AGN发射线特征，以及在恒星形成Lya断层星系（LBGs）中观察到的星际吸收特征。 我们报告了对NIV]1486的探测结果，该发射线曾在高红移射电星系和罕见的光学选择类星体中被观测到。 合成光谱的UV连续谱斜率比非AGN UV选择恒星形成星系样本显著更红。 蓝移的SiIV吸收提供了这些天体中高速（~10^(3) km/s）外流的高度电离气体的证据，这与非AGN LBGs中的外流情况在数量上不同。 通过参数如Ly-alpha当量宽度、红移和UV连续谱大小对单个AGN进行分组，可以分析样本内的主要光谱趋势。 更强的Ly-alpha发射与较弱的低电离吸收相关联，这与在非AGN LBGs中看到的情况相似，并突显了冷星际气体在Ly-alpha光子逃逸中的作用。 然而，AGN合成光谱并未显示出与非AGN LBGs中看到的Ly-alpha强度和消光之间的相同趋势。 这些结果代表了高红移处恒星形成星系与类似宿主AGN活动的星系之间的首次此类比较。 显示英文摘要

摘要： We present new results for a sample of 33 narrow-lined UV-selected active galactic nuclei (AGNs), identified in the course of a spectroscopic survey for star-forming galaxies at z ~ 2-3. The rest-frame UV composite spectrum for our AGN sample shows several emission lines characteristic of AGNs, as well as interstellar absorption features seen in star-forming Lyman Break Galaxies (LBGs). We report a detection of NIV]1486, which has been observed in high-redshift radio galaxies, as well as in rare optically-selected quasars. The UV continuum slope of the composite spectrum is significantly redder than that of a sample of non-AGN UV-selected star forming galaxies. Blueshifted SiIV absorption provides evidence for outflowing highly-ionized gas in these objects at speeds of ~ 10^(3) km/s, quantitatively different from what is seen in the outflows of non-AGN LBGs. Grouping the individual AGNs by parameters such as Ly-alpha equivalent width, redshift, and UV continuum magnitude allows for an analysis of the major spectroscopic trends within the sample. Stronger Ly-alpha emission is coupled with weaker low-ionization absorption, which is similar to what is seen in the non-AGN LBGs, and highlights the role that cool interstellar gas plays in the escape of Ly-alpha photons. However, the AGN composite does not show the same trends between Ly-alpha strength and extinction seen in the non-AGN LBGs. These results represent the first such comparison at high-redshift between star-forming galaxies and similar galaxies that host AGN activity.