The SCUBA-2 850 μm Follow-up of WISE-selected, Luminous Dust-obscured Quasars
The SCUBA-2 850 μm Follow-up of WISE-selected, Luminous Dust-obscured Quasars
复制标题
SCUBA-2 850 μm WISE 选定的、被发光尘埃遮蔽的类星体的后续卫星
DOI：
10.1088/1538-3873/aa8e91
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发表时间：
2017-12-01
影响因子：
3.5
通讯作者：
Knudsen, Kirsten K.
中科院分区：
文献类型：
--
作者：
Fan, Lulu;Jones, Suzy F.;Knudsen, Kirsten K.
热尘遮蔽星系（Hot dust obscured galaxies，简称Hot DOGs）是最近在宽视场红外巡天探测器全天巡天中发现的一个新的星系群。多波长的后续观测表明，它们是明亮的，尘埃遮蔽的类星体在高红移。本文介绍了JCMT SCUBA-2 850 μm对10个热犬的跟踪观测。十分之四的热狗已被检测到在>3σ水平。基于红外光谱的SED分解方法，我们计算了活动星系核环和冷尘埃成分的红外光度。在我们的样品中，热狗是非常明亮的，其中大多数具有L IR tot > 10 14 L λ。环形辐射占总红外能量输出的主导地位。然而，冷尘埃的贡献仍然是不可忽略的，冷尘埃对总红外光度的贡献（约8%-24%）取决于环面模型的选择。热DOG中的冷尘埃温度与具有相似红外光度的紫外亮类星体相当，但远高于SMG中的温度。热狗星系中较高的尘埃温度可能是由于强烈的星暴和活动星系核活动的遮蔽所引起的更强的辐射场。在Hot DOG周围的10个SCUBA-2场中，分别探测到14个和5个亚毫米级偶然源，其能级分别为>3σ和>3.5σ。通过估计它们的累积数量，我们证实了前面的论点，热狗躺在密集的环境。我们的研究结果支持的情况下，热狗是明亮的，尘埃遮蔽的类星体躺在密集的环境中，并在极端的星爆和紫外线明亮的类星体之间的过渡阶段。
Hot dust-obscured galaxies (Hot DOGs) are a new population recently discovered in the Wide-field Infrared Survey Explorer All-Sky survey. Multiwavelength follow-up observations suggest that they are luminous, dust-obscured quasars at high redshift. Here we present the JCMT SCUBA-2 850 μm follow-up observations of 10 Hot DOGs. Four out of ten Hot DOGs have been detected at >3σ level. Based on the IR SED decomposition approach, we derive the IR luminosities of AGN torus and cold dust components. Hot DOGs in our sample are extremely luminous with most of them having L IR tot > 10 14 L ⊙ . The torus emissions dominate the total IR energy output. However, the cold dust contribution is still non-negligible, with the fraction of the cold dust contribution to the total IR luminosity (∼8%–24%) being dependent on the choice of torus model. The derived cold dust temperatures in Hot DOGs are comparable to those in UV bright quasars with similar IR luminosity, but much higher than those in SMGs. Higher dust temperatures in Hot DOGs may be due to the more intense radiation field caused by intense starburst and obscured AGN activities. Fourteen and five submillimeter serendipitous sources in the 10 SCUBA-2 fields around Hot DOGs have been detected at >3σ and >3.5σ levels, respectively. By estimating their cumulative number counts, we confirm the previous argument that Hot DOGs lie in dense environments. Our results support the scenario in which Hot DOGs are luminous, dust-obscured quasars lying in dense environments, and being in the transition phase between extreme starburst and UV-bright quasars.