Alma spectroscopic survey in the hubble ultra deep field: survey description
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Fecha
2016-12
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Facultad/escuela
Idioma
en
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Institute of Physics Publishing
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Licencia CC
Atribution 4.0 International (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
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 (LCO¢ ~ 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 6.0 8.0 < <z . 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.
Notas
Indexación: Scopus.
Palabras clave
Galaxies: Evolution, Galaxies: ISM, Galaxies: High-Redshift, Galaxies: Formation, Surveys
Citación
Astrophysical Journal.Open Access.Volume 833, Issue 1.10 December 2016. Article number 67
DOI
10.3847/1538-4357/833/1/67