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Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IX. Identification of two red quasars at z > 5.6
Publications of the Astronomical Society of Japan ( IF 2.3 ) Pub Date : 2020-08-08 , DOI: 10.1093/pasj/psaa074
Nanako Kato, Yoshiki Matsuoka, Masafusa Onoue, Shuhei Koyama, Yoshiki Toba, Masayuki Akiyama, Seiji Fujimoto, Masatoshi Imanishi, Kazushi Iwasawa, Takuma Izumi, Nobunari Kashikawa, Toshihiro Kawaguchi, Chien-Hsiu Lee, Takeo Minezaki, Tohru Nagao, Akatoki Noboriguchi, Michael A Strauss

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.

中文翻译:

Subaru High-z 对低光度类星体 (SHELLQ) 的探索。九。在 z > 5.6 处识别两个红色类星体

我们首次在高 z 宇宙(z > 5.6)中发现了尘埃变红的类星体(红色类星体)。这是 Subaru High-z 低光度类星体探索 (SHELLQs) 项目的结果,该项目基于 Hyper Suprime-Cam (HSC) 斯巴鲁战略计划调查产生的敏感多波段光学成像数据。我们根据在 3.4 和 4.6 um(静止帧 ~5000-6500 A)的宽视场红外巡天探测器 (WISE) 数据中的检测,从光谱确认的 93 个高 z 类星体中确定了四个红色类星体候选者. 用光谱能量分布 (SED) 拟合光学和中红外波长来估计灰尘变红的量。发现四个候选者中有两个是红色类星体,其尘埃变红 E(BV) > 0.1。剩余的没有单独 WISE 探测的 SHELLQ 类星体在 WISE 波段明显更暗,比红色类星体更蓝,尽管我们确实在叠加图像中在 W1 波段探测到它们。我们还对高 z 光学发光类星体进行了相同的 SED 拟合,但没有发现红色类星体。这证明了斯巴鲁 HSC 发现高 z 红色类星体的能力,由于尘埃灭绝,这些类星体比过去在静止帧紫外线中调查的极限星等要暗。
更新日期:2020-08-08
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