文章基本信息

标题：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*
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作者：Laura Lenkić ; Alberto D.Bolatto ; Natascha M.Förster Schreiber 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：159
期号：5
页码：2641-2660
DOI：10.3847/1538-3881/ab7458
语种：English
出版社：American Institute of Physics
摘要：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.
关键词：Galaxy evolution;Luminosity function;High-redshift galaxies