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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448258.0, MPI für Astronomie / Publikationen_mpia
Imaging atomic and highly excited molecular gas in a z = 6.42 quasar host galaxy: Copious fuel for an Eddington-limited starburst at the end of cosmic reionization
Authors:Riechers, Dominik A.; Walter, Fabian; Bertoldi, Frank; Carilli, Christopher L.; Aravena, Manuel; Neri, Roberto; Cox, Pierre; Weiß, Axel; Menten, Karl M.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:2
Start Page:1338
End Page:1345
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We have imaged CO(J = 7 → 6) and C I(3 P 2 → 3 P 1) emission in the host galaxy of the z = 6.42 quasar SDSS J114816.64+525150.3 (hereafter J1148+5251) through observations with the Plateau de Bure Interferometer. The region showing CO(J = 7 → 6) emission is spatially resolved, and its size of 5 kpc is in good agreement with earlier CO(J = 3 → 2) observations. In combination with a revised model of the collisional line excitation in this source, this indicates that the highly excited molecular gas traced by the CO J = 7 → 6 line is subthermally excited (showing only 58% ± 8% of the CO J = 3 → 2 luminosity), but not more centrally concentrated. We also detect C I(3 P 2 → 3 P 1) emission in the host galaxy of J1148+5251, but the line is too faint to enable a reliable size measurement. From the C I(3 P 2 → 3 P 1) line flux, we derive a total atomic carbon mass of M C I = 1.1 ×107 M sun, which corresponds to ~5 × 10-4 times the total molecular gas mass. We also searched for H2O(J_{K_{a}K_{c}} = 212 → 101) emission, and obtained a sensitive line luminosity limit of L^{\prime }_H_2O 4.4 × 109 K km s-1 pc2, i.e., <15% of the CO(J = 3 → 2) luminosity. The warm, highly excited molecular gas, atomic gas and dust in this quasar host at the end of cosmic reionization maintain an intense starburst that reaches surface densities as high as predicted by (dust opacity) Eddington limited star formation over kiloparsec scales.
Free Keywords:cosmology: observations; galaxies: active; galaxies: formation; galaxies: high-redshift; galaxies: starburst; radio lines: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009ApJ...703.1338R [ID No:1]
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