The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies
The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies
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MUSE 哈勃超深场巡天：II。
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
L. I. A. Potsdam
中科院分区：
文献类型：
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作者：
H. Inami;R. Bacon;J. Brinchmann;J. Richard;T. Contini;S. Conseil;S. Hamer;M. Akhlaghi;N. Bouché;B. Clément;G. Desprez;A. Drake;T. Hashimoto;F. Leclercq;M. Maseda;L. Michel;M. Paalvast;L. Tresse;E. Ventou;W. Kollatschny;L. Boogaard;H. Finley;R. Marino;J. Schaye;L. D. Lyon;L. Observatory;U. Porto;U. Toulouse;Universitat Gottingen;E. Zurich;L. I. A. Potsdam
我们用多单元光谱探测器(MUSE)在哈勃超深场(HUDF)进行了两层光谱测量(1‘×1’超深区和3‘×3’深区)。大视场、高灵敏度和宽波长覆盖相结合，在光谱确认的HUDF红移方面提供了数量级的改进；即，哈勃太空望远镜(HST)连续选定天体的1206个安全光谱红移，相当于总红移的15%(7904)。红移分布远远超出了z>；3，并延伸到Hst/F775W星等，微弱到≈30 mag(AB，1σ)。此外，通过盲目搜索发射线特征，在缪斯数据立方体中发现的没有HST对应物的源获得了132个安全红移。总的来说，我们展示了1338个高质量的红移，与相同领域中已知的光谱红移相比，这是8倍的增加。我们主要用2.9z F775W等z 的光谱特征[OαII]来评估红移，超深场在26.5mag和深场25.5mag处达到50%的完备性，到28-29mag和≳27mag时完备性保持在≈20%。我们使用确定的红移来测试高z星系的连续体颜色选择(丢失)图。F336W的选择条件成功地捕获了≈80%的目标z2.7星系。然而，对于高红移选择(F435W、F606W和F775W辍学)，成功率下降到≈20%-40%。我们从经验上重新定义了选择边界，试图将它们提高到≈的60%。修订的边界允许使用更蓝的颜色来捕获Lyα发射体，其中高Lyα等效宽度落在用于颜色选择的宽带中。与这篇论文一起，我们发布了红移和线通量星表。
We have conducted a two-layered spectroscopic survey (1′ × 1′ ultra deep and 3′ × 3′ deep regions) in the Hubble Ultra Deep Field (HUDF) with the Multi Unit Spectroscopic Explorer (MUSE). The combination of a large field of view, high sensitivity, and wide wavelength coverage provides an order of magnitude improvement in spectroscopically confirmed redshifts in the HUDF; i.e., 1206 secure spectroscopic redshifts for Hubble Space Telescope (HST) continuum selected objects, which corresponds to 15% of the total (7904). The redshift distribution extends well beyond z > 3 and to HST/ F775W magnitudes as faint as ≈ 30 mag (AB, 1 σ ). In addition, 132 secure redshifts were obtained for sources with no HST counterparts that were discovered in the MUSE data cubes by a blind search for emission-line features. In total, we present 1338 high quality redshifts, which is a factor of eight increase compared with the previously known spectroscopic redshifts in the same field. We assessed redshifts mainly with the spectral features [O ii] at z α at 2.9 z F775W magnitude, a 50% completeness is reached at 26.5 mag for ultra deep and 25.5 mag for deep fields, and the completeness remains ≳ 20% up to 28–29 mag and ≈ 27 mag, respectively. We used the determined redshifts to test continuum color selection (dropout) diagrams of high- z galaxies. The selection condition for F336W dropouts successfully captures ≈ 80% of the targeted z ~ 2.7 galaxies. However, for higher redshift selections ( F435W , F606W , and F775W dropouts), the success rates decrease to ≈ 20–40%. We empirically redefine the selection boundaries to make an attempt to improve them to ≈ 60%. The revised boundaries allow bluer colors that capture Ly α emitters with high Ly α equivalent widths falling in the broadbands used for the color-color selection. Along with this paper, we release the redshift and line flux catalog.