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arXiv 2208.03328astro-ph.GA
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十个强透镜星系团后面微弱星系团的亚毫米巡天

A Submillimeter Survey of Faint Galaxies Behind Ten Strong Lensing Clusters

L. L. Cowie, A. J. Barger, F. E. Bauer, C. -C. Chen, L. H. Jones, C. Orquera, M. J. Rosenthal, A. J. Taylor

摘要:

我们提出了深SCUBA-2 450微米和850微米成像的10个强透镜集群。我们提供了一个>4-sigma SCUBA-2 850微米的404个源的目录,这些源位于距离星团中心4.5'的半径内。我们还提供了来自目标ALMA观测的星团A370、MACSJ1149.5+2223和MACSJ0717.5+3745中>4.5-sigma ALMA 870微米探测的目录,以及来自存档ALMA观测的任何星团场中所有其他>4.5-sigma ALMA(大部分为1.2 mm)探测的目录。对于ALMA检测,我们给出光谱或光度红移,在可用的情况下,从我们自己的凯克观测或从文献。我们确认使用450微米至850微米的流量比估计红移。我们使用镜头模型来确定放大率,其中大部分在1.5-4的范围内。补充后的ALMA集群样本与钱德拉深场(CDF)ALMA和SMA样本,我们没有发现证据的亚毫米星系的红移分布的演变缩小到850微米通量的0.5毫焦耳。鉴于这一结果,我们得出结论,我们观察到的趋势增加F160 W到850微米的流量比从较亮到较暗缩小850微米流量的结果,从较暗的亚毫米星系具有较少的消光。然而,在这种关系中存在广泛的传播,包括一些光学/近红外暗星系的存在,其通量低于1 mJy。最后,根据我们的ALMA分析,我们分析了我们的SCUBA-2样品,并提出了55 850微米亮度z>4的候选者。

英文摘要:

We present deep SCUBA-2 450 micron and 850 micron imaging of ten strong lensing clusters. We provide a >4-sigma SCUBA-2 850 micron catalog of the 404 sources lying within a radius of 4.5' from the cluster centers. We also provide catalogs of the >4.5-sigma ALMA 870 micron detections in the clusters A370, MACSJ1149.5+2223, and MACSJ0717.5+3745 from our targeted ALMA observations, along with catalogs of all other >4.5-sigma ALMA (mostly 1.2 mm) detections in any of our cluster fields from archival ALMA observations. For the ALMA detections, we give spectroscopic or photometric redshifts, where available, from our own Keck observations or from the literature. We confirm the use of the 450 micron to 850 micron flux ratio for estimating redshifts. We use lens models to determine magnifications, most of which are in the 1.5-4 range. After supplementing the ALMA cluster sample with Chandra Deep Field (CDF) ALMA and SMA samples, we find no evidence for evolution in the redshift distribution of submillimeter galaxies down to demagnified 850 micron fluxes of 0.5 mJy. Given this result, we conclude that our observed trend of increasing F160W to 850 micron flux ratio from brighter to fainter demagnified 850 micron flux results from the fainter submillimeter galaxies having less extinction. However, there is wide spread in this relation, including the presence of some optical/NIR dark galaxies down to fluxes below 1 mJy. Finally, with insights from our ALMA analysis, we analyze our SCUBA-2 sample and present 55 850 micron-bright z>4 candidates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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