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arXiv 1506.07397astro-ph.GA
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z > 2.5星系的光谱能量分布:Herschel/SPIRE色图的启示

The spectral energy distribution of galaxies at z > 2.5: Implications from the Herschel/SPIRE color-color diagram

F. -T. Yuan, V. Buat, D. Burgarella, L. Ciesla, S. Heinis, S. Shen, Z. Shao, J. -L. Hou

摘要:

利用Herschel SPIRE色图研究了高z星系的光谱能量分布和红移估计。我们编制了一个样本的57个星系光谱确认红移和SPIRE检测在所有三个波段在$z=2.5-6.4$,并比较其平均SPIRE颜色与SED模板从本地和高Z库。我们发现,当地的SED是不一致的高Z观测。局部校准的参数需要进行调整,以描述高z星系的平均颜色。对于高z库,模板从z=0到3的演化可以很好地描述高红移观测的平均颜色。使用这些模板,我们定义了颜色切割,将SPIRE色色图划分为具有不同平均红移的不同区域。我们使用783个Herschel选择星系的大样本测试了这种方法和其他两种颜色切割方法,发现尽管这些方法可以将样本分成具有不同平均红移的群体,但每个群体中的红移分散度相当大。为了更好地取样,需要更多的资料。

英文摘要:

We use the Herschel SPIRE color-color diagram to study the spectral energy distribution (SED) and the redshift estimation of high-z galaxies. We compiled a sample of 57 galaxies with spectroscopically confirmed redshifts and SPIRE detections in all three bands at $z=2.5-6.4$, and compared their average SPIRE colors with SED templates from local and high-z libraries. We find that local SEDs are inconsistent with high-z observations. The local calibrations of the parameters need to be adjusted to describe the average colors of high-z galaxies. For high-z libraries, the templates with an evolution from z=0 to 3 can well describe the average colors of the observations at high redshift. Using these templates, we defined color cuts to divide the SPIRE color-color diagram into different regions with different mean redshifts. We tested this method and two other color cut methods using a large sample of 783 Herschel-selected galaxies, and find that although these methods can separate the sample into populations with different mean redshifts, the dispersion of redshifts in each population is considerably large. Additional information is needed for better sampling.

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