论文标题
Subaru High-Z探索低亮度类星体（ShellQs）。 ix。在z> 5.6处识别两个红色类星体
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IX. Identification of Two Red Quasars at z > 5.6
论文作者
论文摘要
我们介绍了高Z宇宙中的第一个发现粉红色的类星体（红色类星体）（Z> 5.6）。这是Subaru High-Z对低亮度类星体（ShellQ）项目的探索的结果，该项目基于由Hyper Soprime-CAM（HSC）Subaru战略计划调查产生的灵敏的多波段光学成像数据。我们基于在3.4和4.6 um（RESS-FRAME〜5000-6500 A）中的检测，从光谱镜确认的93个高Z类星体中确定了四个红色的候选物。估计了光谱能量分布（SED）的灰尘变红量，而粉尘分布（SED）在光学和中红外波长上估计。发现四个候选者中有两个是红色类星体，其灰尘（B-V）> 0.1。尽管我们确实在堆叠的图像中在W1频段中检测到了它们，但在明智的频段中，没有单个明智检测的剩下的shellqs类星体在明智的频段中显着淡淡，并且比红色类星体更为蓝。我们还针对高Z光光露的类星体进行了相同的SED拟合，但没有发现红色类星体。这证明了Subaru HSC发现High-Z红色类星体的力量，这比由于粉尘的灭绝而导致其余框架紫外线中过去调查的限制幅度更为严重。
We present the first discovery of dust-reddened quasars (red quasars) in the high-z universe (z >5.6). This is a result from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, which is based on the sensitive multi-band optical imaging data produced by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. We identified four red quasar candidates from the spectroscopically confirmed 93 high-z quasars in the SHELLQs sample, based on detections in the Wide-field Infrared Survey Explorer (WISE) data at 3.4 and 4.6 um (rest-frame ~5000-6500 A). The amount of dust reddening was estimated with spectral energy distribution (SED) fits over optical and mid-infrared wavelengths. Two of the four candidates were found to be red quasars with dust reddening of E(B-V) > 0.1. The remaining SHELLQs quasars without individual WISE detections are significantly fainter in the WISE bands and bluer than the red quasars, although we did detect them in the W1 band in a stacked image. We also conducted the same SED fits for high-z optically-luminous quasars, but no red quasar was found. This demonstrates the power of Subaru HSC to discover high-z red quasars, which are fainter than the limiting magnitudes of past surveys in the rest-frame ultraviolet, due to dust extinction.
