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arXiv 0906.4561astro-ph.CO
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对GOODS-N油田-- II进行AzTEC 1.1 mm测量。多波长识别与红移分布

An AzTEC 1.1 mm survey of the GOODS-N field -- II. Multi-wavelength identifications and redshift distribution

E. L. Chapin, A. Pope, D. Scott, I. Aretxaga, J. E. Austermann, R-R. Chary, K. Coppin, M. Halpern, D. H. Hughes, J. D. Lowenthal, G. E. Morrison, T. A. Perera, … 展开作者

E. L. Chapin, A. Pope, D. Scott, I. Aretxaga, J. E. Austermann, R-R. Chary, K. Coppin, M. Halpern, D. H. Hughes, J. D. Lowenthal, G. E. Morrison, T. A. Perera, K. S. Scott, G. W. Wilson, M. S. Yun

摘要:

我们介绍了使用AzTEC相机在1.1mm处对大天文台起源深空探测-北场进行的29个源(错误检测概率<5%)的多波长研究结果。与现有的850微米SCUBA研究领域相比,我们检查在两个波长选择的源种群的差异。AzTEC观测均匀地覆盖了整个调查场,深度为1-sigma ~ 1 mJy。搜索深1.4GHz的VLA,和斯皮策3- 24微米目录,我们确定了强大的同行21 1.1毫米的来源,和暂定协会为其余的对象。AzTEC源的红移分布是从现有的光谱和光度红移推断的。我们发现一个中值红移z=2.7,略高于z=2.0的850微米选择源在同一领域,我们最低的红移鉴定在于光谱红移z=1.1460。我们测量了源的850 um到1.1mm的颜色,没有发现“850 um脱落”的证据,这可以通过观测的低SNR来解释。我们还结合这些观测到的颜色与光谱红移,得出尘埃温度T的范围,和尘埃发射率指数$β$的样品,得出结论,现有的估计T~ 30 K和$β$ ~1.75是与这些新的数据相一致。

英文摘要:

We present results from a multi-wavelength study of 29 sources (false detection probabilities <5%) from a survey of the Great Observatories Origins Deep Survey-North field at 1.1mm using the AzTEC camera. Comparing with existing 850um SCUBA studies in the field, we examine differences in the source populations selected at the two wavelengths. The AzTEC observations uniformly cover the entire survey field to a 1-sigma depth of ~1mJy. Searching deep 1.4GHz VLA, and Spitzer 3--24um catalogues, we identify robust counterparts for 21 1.1mm sources, and tentative associations for the remaining objects. The redshift distribution of AzTEC sources is inferred from available spectroscopic and photometric redshifts. We find a median redshift of z=2.7, somewhat higher than z=2.0 for 850um-selected sources in the same field, and our lowest redshift identification lies at a spectroscopic redshift z=1.1460. We measure the 850um to 1.1mm colour of our sources and do not find evidence for `850um dropouts', which can be explained by the low-SNR of the observations. We also combine these observed colours with spectroscopic redshifts to derive the range of dust temperatures T, and dust emissivity indices $β$ for the sample, concluding that existing estimates T~30K and $β$~1.75 are consistent with these new data.

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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