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http://hdl.handle.net/20.500.12386/26246
Titolo: | ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Survey Description | Autori: | 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 Gónzalez-López, Jorge Ibar, Edo Inami, Hanae Infante, Leopoldo Hodge, Jacqueline Karim, Alex Le Fevre, Olivier Magnelli, Benjamin Neri, Roberto Oesch, Pascal Ota, Kazuaki Popping, Gergö Rix, Hans-Walter Sargent, Mark Sheth, Kartik VAN DER WEL, ARJEN van der Werf, Paul Wagg, Jeff |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 833 | Fascicolo: | 1 | Da pagina:: | 67 | Abstract: | 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 ({L}<SUB>{CO</SUB>}<SUP>\prime </SUP> ∼ 2 × 10<SUP>9</SUP> K km s<SUP>-1</SUP> pc<SUP>2</SUP>), and continuum noise levels of 3.8 μJy beam<SUP>-1</SUP> and 12.7 μJy beam<SUP>-1</SUP>, 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\lt z\lt 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 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. | URI: | http://hdl.handle.net/20.500.12386/26246 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/833/1/67 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/833/1/67 | Bibcode ADS: | 2016ApJ...833...67W | Fulltext: | open |
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