arXiv 2203.010492022-03-02astro-ph.GA

500 μ m冒口II的性质：亚毫米级微尘埃星状成釉

The Nature of 500 Micron Risers II: Sub-mm Faint Dusty Star Forming Galaxies

J. Cairns, D. L. Clements, J. Greenslade, G. Petitpas, T. Cheng, Y. Ding, A. Parmar, I. Pérez-Fournon, D. Riechers

备注：: 20 pages, 13 figures, 3 tables. Submitted to MNRAS

摘要：

我们目前的SCUBA-2和SMA的后续观测的四个候选高红移尘埃恒星形成星系，被选为源与上升的SED在250，350和500 $μ$ m赫歇尔SPIRE带。以前的SMA观测没有显示这些源的对应物，但在我们更深的亚毫米观测中，我们检测到所有四个500 $μ$的对应物，其中三个分解成多个系统。对于这三个多重系统，SMA 345 GHz（$\approx 870μ$ m）的观测恢复$123 \pm 73\%$，$60 \pm 15\%$和$19 \pm 4\%$分别从SCUBA-2的综合850 $μ$ m的通量密度，表明可能有额外的来源低于我们的SMA探测极限，构成一个密集的原星系团核心。第四个500 $μ$ m立管的观测频率较低，因此我们无法进行类似的比较。我们估计测光红移的基础上FIR/亚毫米颜色，发现3/4可能位于$z \geq 2$。这符合500 $μ$米上升器选择标准的解释，既选择固有的红色，个别星系在$z > 4$，和多个系统在更温和的红移，人工红的混合效果。我们使用SCUBA-2 850 $μ$ m的地图来调查这些500 $μ$ m的环境。通过构建周围SCUBA-2探测到的累积计数和估算光度红移，我们发现我们的500个$μ$ m中的一个可能存在于一个$z \geq 2$原星系团中。我们推断，明亮的500 $μ$ m的亮度与微弱的850 $μ$ m的流量密度通常是多个系统在$z \geq 2$，可能存在于超密度的明亮的亚毫米星系。

英文摘要：

We present SCUBA-2 and SMA follow-up observations of four candidate high redshift Dusty Star-Forming Galaxies, selected as sources with rising SEDs in the 250, 350 and 500$μ$m Herschel SPIRE bands. Previous SMA observations showed no counterparts to these sources, but in our deeper sub-mm observations we detect counterparts to all four 500$μ$m risers, with three resolving into multiple systems. For these three multiple systems, the SMA 345GHz ($\approx 870μ$m) observations recover $123 \pm 73\%$, $60 \pm 15\%$ and $19 \pm 4\%$ respectively of the integrated 850$μ$m flux density from SCUBA-2, indicating that there may be additional sources below our SMA detection limit making up a dense, protocluster core. The fourth 500$μ$m riser was observed at a lower frequency and so we cannot make a similar comparison. We estimate photometric redshifts based on FIR/sub-mm colours, finding that 3/4 likely lie at $z \geq 2$. This fits with the interpretation that the 500$μ$m riser selection criterion selects both intrinsically red, individual galaxies at $z > 4$, and multiple systems at more moderate redshifts, artificially reddened by the effects of blending. We use the SCUBA-2 850$μ$m maps to investigate the environments of these 500$μ$m risers. By constructing cumulative number counts and estimating photometric redshifts for surrounding SCUBA-2 detections, we find that one of our 500$μ$m risers could plausibly reside in a $z \geq 2$ protocluster. We infer that bright 500$μ$m risers with faint 850$μ$m flux densities are typically multiple systems at $z \geq 2$ that may reside in overdensities of bright sub-mm galaxies.

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英文摘要：

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