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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709705.0, MPI für Astronomie / Publikationen_mpia
A molecular linescan in the Hubble Deep Field North: Constraints on the CO luminosity function and the cosmic H2 density
Authors:Walter, F.; Decarli, R.; Sargent, M.; Carilli, C.; Dickinson, M.; Riechers, D.; Ellis, R.; Stark, D.; Weiner, B.; Aravena, M.; Bell, E.; Bertoldi, F.; Cox, P.; Da Cunha, E.; Daddi, E.; Downes, D.; Lentati, L.; Maiolino, R.; Menten, K. M.; Neri, R.; Rix, H. -. W.; Weiss, A.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 79 (7 pp)
Audience:Not Specified
Abstract / Description:We present direct constraints on the CO luminosity function at high redshift and the resulting cosmic evolution of the molecular gas density, \rho _H_2(z), based on a blind molecular line scan in the Hubble Deep Field North (HDF-N) using the IRAM Plateau de Bure Interferometer. Our line scan of the entire 3 mm window (79-115 GHz) covers a cosmic volume of ~7000 Mpc3, and redshift ranges z < 0.45, 1.01 < z < 1.89 and z > 2. We use the rich multiwavelength and spectroscopic database of the HDF-N to derive some of the best constraints on CO luminosities in high redshift galaxies to date. We combine the blind CO detections in our molecular line scan (presented in a companion paper) with stacked CO limits from galaxies with available spectroscopic redshifts (slit or mask spectroscopy from Keck and grism spectroscopy from the Hubble Space Telescope) to give first blind constraints on high-z CO luminosity functions and the cosmic evolution of the H2 mass density \rho _H_2(z) out to redshifts z ~ 3. A comparison to empirical predictions of \rho _H_2(z) shows that the securely detected sources in our molecular line scan already provide significant contributions to the predicted \rho _H_2(z) in the redshift bins langzrang ~ 1.5 and langzrang ~ 2.7. Accounting for galaxies with CO luminosities that are not probed by our observations results in cosmic molecular gas densities \rho _H_2(z) that are higher than current predictions. We note, however, that the current uncertainties (in particular the luminosity limits, number of detections, as well as cosmic volume probed) are significant, a situation that is about to change with the emerging ALMA observatory.
Free Keywords:cosmology: observations; galaxies: evolution; galaxies: formation; infrared: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637X/782/2/79
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