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  Plateau de Bure High-z Blue Sequence Survey 2 (PHIBSS2): Search for secondary sources, CO luminosity functions in the field, and the evolution of molecular gas density through cosmic time

Lenkić, L., Bolatto, A. D., Förster Schreiber, N. M., Tacconi, L. J., Neri, R., Combes, F., et al. (2020). Plateau de Bure High-z Blue Sequence Survey 2 (PHIBSS2): Search for secondary sources, CO luminosity functions in the field, and the evolution of molecular gas density through cosmic time. Astronomical Journal, 159(5): 190. doi:10.3847/1538-3881/ab7458.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-8DCC-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-8DCD-5
Genre: Journal Article

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Lenkić, Laura, Author
Bolatto, Alberto D., Author
Förster Schreiber, Natascha M.1, Author              
Tacconi, Linda J.1, Author              
Neri, Roberto, Author
Combes, Francoise, Author
Walter, Fabian, Author
García-Burillo, Santiago, Author
Genzel, Reinhard1, Author              
Lutz, Dieter1, Author              
Cooper, Michael C., Author
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1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: We report on the results of a search for serendipitous sources in CO emission in 110 cubes targeting CO(2 − 1), CO(3 − 2), and CO(6 − 5) at z ~ 1–2 from the second Plateau de Bure High-z Blue Sequence Survey (PHIBSS2). The PHIBSS2 observations were part of a 4 yr legacy program at the IRAM Plateau de Bure Interferometer aimed at studying early galaxy evolution from the perspective of molecular gas reservoirs. We present a catalog of 67 candidate secondary sources from this search, with 45 of the 110 data cubes showing sources in addition to the primary target that appear to be field detections, unrelated to the central sources. This catalog includes redshifts, line widths, and fluxes, as well as an estimation of their reliability based on their false-positive probability. We perform a search in the 3D Hubble Space Telescope/CANDELS catalogs for the secondary CO detections and tentatively find that ~64% of these have optical counterparts, which we use to constrain their redshifts. Finally, we use our catalog of candidate CO detections to derive the CO(2 − 1), CO(3 − 2), CO(4 − 3), CO(5 − 4), and CO(6 − 5) luminosity functions over a range of redshifts, as well as the molecular gas mass density evolution. Despite the different methodology, these results are in very good agreement with previous observational constraints derived from blind searches in deep fields. They provide an example of the type of "deep-field" science that can be carried out with targeted observations.

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Language(s): eng - English
 Dates: 2020-04-07
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-3881/ab7458
Other: LOCALID: 3237874
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Title: Astronomical Journal
  Other : Astron. J.
Source Genre: Journal
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Publ. Info: Chicago : Published by the University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 159 (5) Sequence Number: 190 Start / End Page: - Identifier: ISSN: 0004-6256
CoNE: https://pure.mpg.de/cone/journals/resource/954922828207