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arXiv 1903.09161astro-ph.GA
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HUDF中的ALMA光谱测量:CO发射线和3 mm连续谱源

The ALMA Spectroscopic Survey in the HUDF: CO emission lines and 3 mm continuum sources

Jorge González-López, Roberto Decarli, Ricardo Pavesi, Fabian Walter, Manuel Aravena, Chris Carilli, Leindert Boogaard, Gergö Popping, Axel Weiss, Roberto J. As… 展开作者

Jorge González-López, Roberto Decarli, Ricardo Pavesi, Fabian Walter, Manuel Aravena, Chris Carilli, Leindert Boogaard, Gergö Popping, Axel Weiss, Roberto J. Assef, Franz Erik Bauer, Frank Bertoldi, Richard Bouwens, Thierry Contini, Paulo C. Cortes, Pierre Cox, Elisabete da Cunha, Emanuele Daddi, Tanio Díaz-Santos, Hanae Inami, Jacqueline Hodge, Rob Ivison, Olivier Le Fèvre, Benjamin Magnelli, Pascal esch, Dominik Riechers, Hans--Walter Rix, Ian Smail, A. M. Swinbank, Rachel S. Somerville, Bade Uzgil, Paul van der Werf

摘要:

在{ \it Hubble}超深场中的ALMA光谱巡天是ALMA的一个大型计划,它获得了3 mm波段的频率扫描,以探测遥远星系中分子气体的发射线。在这里,我们提出了我们的搜索策略,在HUDF的发射线和连续源。我们比较了文献中使用的几种线搜索算法,并在评估显著性时严格考虑候选发射线的线宽。在我们的搜索中,我们确定了16条高保真发射线。将这些源与多波长数据进行比较,我们发现所有源都具有光学/红外对应物。我们的搜索还恢复了具有较低显著性的候选者,这些候选者可以在统计上用于导出例如CO光度函数。我们应用相同的检测算法来获得六个3 mm连续光源的样本。所有这些也被检测到在1.2毫米的连续光学/近红外同行。我们使用的连续源计算3毫米数计数在子mJy制度,并发现它们是高的一个数量级比预期的同步加速器为主的来源。然而,当尘埃辐射率指数为$β=1.5$,尘埃温度为35 K,平均红移为$z=2.5$时,外推到3 mm时,其计数值与短波长(0.85- 1.3mm)下的计数值是一致的。这些结果代表了迄今为止对3 mm数量计数的模糊端的最佳约束。

英文摘要:

The ALMA SPECtroscopic Survey in the {\it Hubble} Ultra Deep Field is an ALMA large program that obtained a frequency scan in the 3\,mm band to detect emission lines from the molecular gas in distant galaxies. We here present our search strategy for emission lines and continuum sources in the HUDF. We compare several line search algorithms used in the literature, and critically account for the line-widths of the emission line candidates when assessing significance. We identify sixteen emission lines at high fidelity in our search. Comparing these sources to multi-wavelength data we find that all sources have optical/infrared counterparts. Our search also recovers candidates that have lower significance that can be used statistically to derive, e.g. the CO luminosity function. We apply the same detection algorithm to obtain a sample of six 3 mm continuum sources. All of these are also detected in the 1.2 mm continuum with optical/near-infrared counterparts. We use the continuum sources to compute 3 mm number counts in the sub-mJy regime, and find them to be higher by an order of magnitude than expected for synchrotron-dominated sources. However, the number counts are consistent with those derived at shorter wavelengths (0.85--1.3\,mm) once extrapolating to 3\,mm with a dust emissivity index of $β=1.5$, dust temperature of 35\,K and an average redshift of $z=2.5$. These results represent the best constraints to date on the faint end of the 3 mm number counts.

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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