用南部非洲大望远镜对WISE选择的遮蔽类星体的光谱巡天
A Spectroscopic Survey of WISE-selected Obscured Quasars with the Southern African Large Telescope
摘要：
我们提出了一个样本的40个候选人的遮蔽类星体的光谱调查的结果确定的基础上，他们的中红外发射探测的宽视场红外巡天探测器（WISE）。这次巡天的光谱是用南部非洲大望远镜上的罗伯特·斯托比摄谱仪获得的。我们的样品被选择与智慧的颜色特征的活动星系核，以及红色的光学中红外的颜色，表明光学/紫外活动星系核连续被尘埃遮蔽。我们获得安全的红移的对象，包括我们的样本（35/40）的大多数，并发现，在WISE W 4（22 $μ$ m）带明亮的源通常是在中等红移（<z>= 0.35 $) while sources fainter in W4 are at higher redshifts (<z> = 0.73$）。大多数的源有窄的发射线，与我们的WISE选择的源的光学颜色和发射线比是一致的活动星系核的轨迹上的休息框架$g-z$颜色与[NeIII] $λ$ 3869 / [OII] $λλ$ 3726+3729线比诊断图。我们还使用经验AGN和星系模板来模拟我们样本中的物体的光谱能量分布（SED），并发现虽然这些物体的观测SED存在显着变化，但大多数都需要强大的AGN组件。最后，我们使用我们的光谱和SED的分析结果，比较我们的选择标准，在文献中提出的替代标准。这些结果验证了基于它们的WISE颜色选择发光遮蔽活动星系核的有效性。
英文摘要：
We present the results of an optical spectroscopic survey of a sample of 40 candidate obscured quasars identified on the basis of their mid-infrared emission detected by the Wide-Field Infrared Survey Explorer (WISE). Optical spectra for this survey were obtained using the Robert Stobie Spectrograph (RSS) on the Southern African Large Telescope (SALT). Our sample was selected with WISE colors characteristic of AGNs, as well as red optical to mid-IR colors indicating that the optical/UV AGN continuum is obscured by dust. We obtain secure redshifts for the majority of the objects that comprise our sample (35/40), and find that sources that are bright in the WISE W4 (22$μ$m) band are typically at moderate redshift (<z> = 0.35$) while sources fainter in W4 are at higher redshifts (<z> = 0.73$). The majority of the sources have narrow emission lines, with optical colors and emission line ratios of our WISE-selected sources that are consistent with the locus of AGN on the rest-frame $g-z$ color vs. [NeIII]$λ$3869 / [OII]$λλ$3726+3729 line ratio diagnostic diagram. We also use empirical AGN and galaxy templates to model the spectral energy distributions (SEDs) for the objects in our sample, and find that while there is significant variation in the observed SEDs for these objects, the majority require a strong AGN component. Finally, we use the results from our analysis of the optical spectra and the SEDs to compare our selection criteria to alternate criteria presented in the literature. These results verify the efficacy of selecting luminous obscured AGNs based on their WISE colors.
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