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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693433.0, MPI für Astronomie / Publikationen_mpia
A deep search for molecular gas in two massive Lyman break galaxies at z = 3 and 4: Vanishing CO-emission due to low metallicity?
Authors:Tan, Q.; Daddi, E.; Sargent, M.; Magdis, G.; Hodge, J.; Béthermin, M.; Bournaud, F.; Carilli, C.; Dannerbauer, H.; Dickinson, M.; Elbaz, D.; Gao, Y.; Morrison, G.; Owen, F.; Pannella, M.; Riechers, D.; Walter, F.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:The Astrophysical Journal Letters
Issue / Number:2
Start Page:id. L24 (6 pp)
Review Status:Internal review
Audience:Experts Only
Abstract / Description:We present deep IRAM Plateau de Bure Interferometer observations, searching for CO-emission toward two massive, non-lensed Lyman break galaxies at z = 3.216 and 4.058. With one low significance CO detection (3.5σ) and one sensitive upper limit, we find that the CO lines are gsim3-4 times weaker than expected based on the relation between IR and CO luminosities followed by similarly massive galaxies at z = 0-2.5. This is consistent with a scenario in which these galaxies have low metallicity, causing an increased CO-to-H2 conversion factor, i.e., weaker CO-emission for a given molecular (H2) mass. The required metallicities at z > 3 are lower than predicted by the fundamental metallicity relation at these redshifts, consistent with independent evidence. Unless our galaxies are atypical in this respect, detecting molecular gas in normal galaxies at z > 3 may thus remain challenging even with ALMA.
Free Keywords:galaxies: evolution; galaxies: high-redshift; galaxies: star formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X [ID No:1]
URL: [ID No:2]
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