ALMA SPECTROSCOPIC SURVEY IN THE HUBBLE ULTRA DEEP FIELD: SURVEY DESCRIPTION

作者：Walter Fabian; Decarli Roberto; Aravena Manuel; Carilli Chris; Bouwens Rychard; da Cunha Elisabete; Daddi Emanuele; Ivison R J; Riechers Dominik; Smail Ian; Swinbank Mark; Weiss Axel; Anguita Timo; Assef Roberto; Bacon Roland; Bauer Franz; Bell Eric F; Bertoldi Frank; Chapman Scott; Colina Luis; Cortes Paulo C; Cox Pierre; Dickinson Mark; Elbaz David; Gonzalez Lopez Jorge; Ibar Edo; Inami Hanae; Infante Leopoldo; Hodge Jacqueline; Karim Alex; Le Fevre Olivier

来源：Astrophysical Journal, 2016, 833(1): 67.

DOI：10.3847/1538-4357/833/1/67

• galaxies:evolution
• galaxies:ISM
• galaxies:high-redshift
• galaxies:formation
• surveys

We present the rationale for and the observational description of ASPECS: the ALMA SPECtroscopic Survey in the Hubble Ultra-Deep Field (UDF), the cosmological deep field that has the deepest multi-wavelength data available. Our overarching goal is to obtain an unbiased census of molecular gas and dust continuum emission in high-redshift (z > 0.5) galaxies. The similar to 1' region covered within the UDF was chosen to overlap with the deepest available imaging from the Hubble Space Telescope. Our ALMA observations consist of full frequency scans in band. 3 (84-115 GHz) and band. 6 (212-272 GHz) at approximately uniform line sensitivity (L'(CO) similar to 2 x 10(9) K km s(-1) pc(2)), and continuum noise levels of 3.8 mu Jy beam(-1) and 12.7 ae Jy beam(-1), respectively. The molecular surveys cover the different rotational transitions of the CO molecule, leading to essentially full redshift coverage. The [C II] emission line is also covered at redshifts 6.0 < z < 8.0. We present a customized algorithm to identify line candidates in the molecular line scans. and quantify our ability to recover artificial sources from our data. Based on whether multiple CO lines are detected, and whether optical spectroscopic redshifts as well as optical counterparts exist, we constrain the most likely line identification. We report 10 (11) CO line candidates in the 3mm (1mm) band, and our statistical analysis shows that < 4 of these (in each band) are likely spurious. Less than one-third. of the total CO flux in the low-J CO line candidates are from sources that are not associated with an optical/NIR counterpart. We also present continuum maps of both the band. 3 and band. 6 observations. The data presented here form the basis of a number of dedicated studies that are presented in subsequent papers.

• 出版日期2016-12-10
• 单位中国地震局