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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660600.0, MPI für Astronomie / Publikationen_mpia
Evidence for low extinction in actively star-forming galaxies at z > 6.5
Authors:Walter, F.; Decarli, R.; Carilli, C.; Riechers, D.; Bertoldi, F.; Weiß, A.; Cox, P.; Neri, R.; Maiolino, R.; Ouchi, M.; Egami, E.; Nakanishi, K.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astrophysical Journal
Issue / Number:2
Start Page:id. 93
Audience:Not Specified
Abstract / Description:We present a search for the [C II] 158 μm fine structure line (a main cooling line of the interstellar medium) and the underlying far-infrared (FIR) continuum in three high-redshift (6.6 < z < 8.2) star-forming galaxies using the IRAM Plateau de Bure Interferometer. We targeted two Lyα-selected galaxies (Lyα emitters, LAEs) with moderate UV-based star formation rates (SFRs ~ 20 M &sun; yr-1 Himiko at z = 6.6 and IOK-1 at z = 7.0) and a gamma-ray burst (GRB) host galaxy (GRB 090423 at z ~ 8.2). Based on our 3σ rest-frame FIR continuum limits, previous (rest-frame) UV continuum measurements and spectral energy distribution (SED) fitting, we rule out SED shapes similar to highly obscured galaxies (e.g., Arp 220, M 82) and less extreme dust-rich nearby spiral galaxies (e.g., M 51) for the LAEs. Conservatively assuming an SED shape typical of local spiral galaxies we derive upper limits for the FIR-based star formation rates (SFRs) of ~70 M &sun; yr-1, ~50 M &sun; yr-1, and ~40 M &sun; yr-1 for Himiko, IOK-1, and GRB 090423, respectively. For the LAEs these limits are only a factor ~3 higher than the published
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
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