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arXiv 1709.07971astro-ph.GA
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SCUBA-2 850 $μm$对WISE选择的发光尘埃遮蔽类星体的后续观测

The SCUBA-2 850 $μm$ follow-up of WISE-selected, luminous dust-obscured quasars

Lulu Fan, Suzy F. Jones, Yunkun Han, Kirsten K. Knudsen

摘要:

热尘遮蔽星系(Hot DOGs)是最近在\wise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。在这里,我们介绍了JCMT SCUBA-2 850 $μm$的10个热狗的后续观察。在$>3σ$级别检测到十分之四的Hot DOG。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。在我们的样本中,热狗是非常明亮的,其中大多数具有$L_{\rm IR}^{\rm tot}>10^{14} L_\odot$。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$(\sim 8-24\%)$的贡献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。分别在$>3σ$和$>3.5σ$水平上探测到了14个和5个亚毫米波偶然源。通过估计它们的累积数量,我们证实了前面的论点,热狗位于密集的环境。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。

英文摘要:

Hot dust-obscured galaxies (Hot DOGs) are a new population recently discovered in the \wise 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 $L_{\rm IR}^{\rm tot}>10^{14} L_\odot$. 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 $(\sim 8-24\%)$ 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.

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