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

By F. Walter, R. Decarli, M. Aravena, C. Carilli, R. Bouwens, E. D. Cunha, E. Daddi, R. Ivison, D. Riechers, I. Smail and 32 more. 2016

179 citations recorded by the source corpus.

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 ∼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 ( 2 × 109 K km s−1 pc2), and continuum noise levels of 3.8 μJy beam−1 and 12.7 μJy 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 . 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 3 mm (1 mm) 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.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/3bc411a2c1e9843d900e729bd4daffa808c1159d

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Citations in the corpus

JADES Initial Data Release for the Hubble Ultra Deep Field: Revealing the Faint Infrared Sky with Deep JWST NIRCam Imaging (2023, background): “…investment of Chandra imaging ( e.g., Xue et al. 2016 ) , deep Atacama Large Millimeter / submillimeter Array observations ( Aravena et al. 2016; Walter et al. 2016; Dunlop et al. 2017; Hatsukade et al. 2018 ) , deep Very Large Array imaging ( e.g., Rujopakarn et al. 2016 ) , and large…”
An ALMA survey of the SCUBA-2 CLS UDS field: physical properties of 707 sub-millimetre galaxies (2019, methodology): “…years of operations, ALMA has been used to undertake a number of typically deep continuum surveys of small contiguous fields (Hatsukade et al. 2016; Walter et al. 2016; Dunlop et al. 2017; Franco et al. 2018; Hatsukade et al. 2018; Muñoz Arancibia et al. 2018; Umehata et al. 2018), with areas of…”
The MUSE Hubble Ultra Deep Field Survey: I. Survey description, data reduction and source detection (2017, methodology): “Thanks to a large range of ancillary data taken with other telescopes, Article published by EDP Sciences A1, page 1 of 20 including for example Chandra (Xue et al. 2011; Luo et al. 2017), XMM (Comastri et al. 2011), ALMA (Walter et al. 2016; Dunlop et al. 2017), Spitzer/IRAC (Labbé et al. 2015), and”