A NOEMA molecular line scan of the Hubble Deep Field North: Improved constraints on the CO luminosity functions and cosmic density of molecular gas

Abstract

We present measurements of the CO luminosity functions (LFs) and the evolution of the cosmic molecular gas density out to z~6 based on an 8.5 arcmin^2 spectral scan survey at 3mm of the iconic Hubble Deep Field North (HDF-N) observed with the NOrthern Extended Millimeter Array (NOEMA). We use matched filtering to search for line emission from galaxies and determine their redshift probability distributions exploiting the extensive multi-wavelength data for the HDF-N. We identify the 7 highest-fidelity sources as CO emitters at 1<z<6, including the well-known submillimeter galaxy HDF850.1 at z=5.18. Four high-fidelity 3mm continuum sources are all found to be radio galaxies at z<=1, plus HDF850.1. We constrain the CO LFs in the HDF-N out to z~6, including a first measurement of the CO(5-4) LF at <z>=5.0. The relatively large area and depth of the NOEMA HDF-N survey extends the existing luminosity functions at 1<z<4 above the knee, yielding a somewhat lower density by 0.15-0.4 dex at the overlap region for the CO(2-1) and CO(3-2) transitions, attributed to cosmic variance. We perform a joint analysis of the CO LFs in the HDF-N and Hubble Ultra Deep Field from ASPECS, finding that they can be well described by a single Schechter function. The evolution of the cosmic molecular gas density from a joint analysis is in good agreement with earlier determinations. This implies that the impact of cosmic field-to-field variance on the measurements is consistent with previous estimates, adding to the challenges for simulations that model galaxies from first principles.

19 pages, 13 figures, 7 tables. Accepted for publication in the Astrophysical Journal (ApJ)

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