Identifying clustering at high redshift through actively star-forming galaxies

Identifying clustering at high redshift through actively star-forming galaxies
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通过活跃的恒星形成星系识别高红移处的聚类

DOI:
10.1093/mnras/stt2306
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发表时间:
2014
影响因子:
4.8
通讯作者:
Davies L
Davies L
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Davies L

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识别高红移(即 z> 1)的星系团对于我们理解当前的宇宙学模型至关重要。然而,随着红移的增加,星团在恒星形成活动中发生了相当大的演化,因此不太可能使用广泛使用的红序列方法来识别。在这里,我们评估了使用活跃的恒星形成星系(亚毫米​​星系,SMG,与 BzKs/LBG 密度过高相关)来识别高红移星团的可行性。我们执行 2D 和 3D 聚类分析,以确定是否可以在仅提供 2D 数据的情况下识别真正的 (3D) 聚类。正如预期的那样,我们发现二维聚类信号充其量是微弱的,并且推断的结果取决于方法。在我们的 3D 分析中,我们确定了 12 个 SMG 与空间上和红移上重合的星系密度过高相关——在我们的样本中,只有 8% 的 SMG 具有已知的红移。当我们的目标区域中的 SMG 缺乏已知的红移时,它们的视线并不比空白天空区域更可能显示集群;需要 SMG 的先前红移信息来识别真正的聚类信号。我们发现,典型冲锋枪周围的集群强度虽然可以识别,但并不例外。然而,我们发现了少数高度聚集的区域,它们都与 SMG 相关。其中最值得注意的是,围绕 LESS J033336.8−274401,可能包含一个 SMG、一个准恒星物体 (QSO) 和 36 个恒星形成星系(>20σ 超密度),所有 atz∼ 1.8。该区域很可能代表一个活跃的恒星形成星团,并说明了利用恒星形成星系来选择早期星团地点的成功。鉴于具有大量光谱或高质量且可靠的光度红移的深场数量不断增加,这为年轻宇宙中的星团识别开辟了一条新途径。
Identifying galaxy clustering at high redshift (i.e.z> 1) is essential to our understanding of the current cosmological model. However, at increasing redshift, clusters evolve considerably in star formation activity and so are less likely to be identified using the widely used red-sequence method. Here we assess the viability of instead identifying high-redshift clustering using actively star-forming galaxies (submillimetre galaxies, SMGs, associated with overdensities ofBzKs/LBGs). We perform both a 2D and 3D clustering analysis to determine whether or not true (3D) clustering can be identified where only 2D data are available. As expected, we find that 2D clustering signals are weak at best and inferred results are method dependent. In our 3D analysis, we identify 12 SMGs associated with an overdensity of galaxies coincident both spatially and in redshift – just 8 per cent of SMGs with known redshifts in our sample. Where an SMG in our target fields lacks a known redshift, their sight line is no more likely to display clustering than blank sky fields; prior redshift information for the SMG is required to identify a true clustering signal. We find that the strength of clustering in the volume around typical SMGs, while identifiable, is not exceptional. However, we identify a small number of highly clustered regions, all associated with an SMG. The most notable of these, surrounding LESS J033336.8−274401, potentially contains an SMG, a quasi stellar object (QSO) and 36 star-forming galaxies (a >20σ overdensity) all atz∼ 1.8. This region is highly likely to represent an actively star-forming cluster and illustrates the success of using star-forming galaxies to select sites of early clustering. Given the increasing number of deep fields with large volumes of spectroscopy, or high quality and reliable photometric redshifts, this opens a new avenue for cluster identification in the young Universe.
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DOI: --
发表时间: 2012
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发表时间: 2010
影响因子: 4.8
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发表时间: 2010-12
期刊: The Astrophysical Journal
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DOI: 10.1093/mnras/stt929
发表时间: 2013
影响因子: 4.8
作者:
Davies L
通讯作者: Davies L
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发表时间: 2010-08
期刊: The Astrophysical Journal
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