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We report on the results of a search for serendipitous sources in CO emissionin 110 cubes targeting CO(2-1), CO(3-2), and CO(6-5) at z ~ 1-2 from the secondPlateau de Bure High-z Blue-Sequence Survey (PHIBSS2). The PHIBSS2 observationswere part of a 4-year legacy program at the IRAM Plateau de Bure Interferometeraimed at studying early galaxy evolution from the perspective of molecular gasreservoirs. We present a catalog of 67 candidate secondary sources from thissearch, with 45 out of the 110 data cubes showing sources in addition to theprimary target that appear to be field detections, unrelated to the centralsources. This catalog includes the redshifts, line widths, fluxes, as well asan estimation of their reliability based on their false positive probability.We perform a search in the 3D-HST/CANDELS catalogs for the secondary COdetections and tentatively find that ~64% of these have optical counterparts,which we use to constrain their redshifts. Finally, we use our catalog ofcandidate CO detections to derive the CO(2-1), CO(3-2), CO(4-3), CO(5-4), andCO(6-5) luminosity functions over a range of redshifts, as well as themolecular gas mass density evolution. Despite the different methodology, theseresults are in very good agreement with previous observational constraintsderived from blind searches in deep fields. They provide an example of the typeof "deep field" science that can be carried out with targeted observations.

the astronomical journal

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