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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559095.0, MPI für Astronomie / Publikationen_mpia
High-resolution CO and radio imaging of ULIRGs: extended CO structures and implications for the universal star formation law
Authors:Bothwell, M. S.; Chapman, S. C.; Tacconi, L.; Smail, I.; Ivison, R. J.; Casey, C. M.; Bertoldi, F.; Beswick, R.; Biggs, A.; Blain, A. W.; Cox, P.; Genzel, R.; Greve, T. R.; Kennicutt, R.; Muxlow, T.; Neri, R.; Omont, A.
Date of Publication (YYYY-MM-DD):2010
Journal Abbrev.:Monthly Notices of the Royal Astronomical Society
Issue / Number:1
Start Page:219
End Page:233
Audience:Not Specified
Abstract / Description:We present high spatial resolution (0.4 arcsec, kpc) Plateau de Bure Interferometer interferometric data on three ultraluminous infrared galaxies (ULIRGs) at : two submillimetre galaxies (SMGs) and one submillimetre faint star-forming radio galaxy. The three galaxies have been robustly detected in CO rotational transitions, either 12CO (J = 43) or 12CO (J = 32), allowing their sizes and gas masses to be accurately constrained. These are the highest spatial resolution observations observed to date (by a factor of 2) for intermediate-excitation CO emission in ULIRGs. The galaxies appear extended over several resolution elements, having a mean radius of 3.7 kpc. High-resolution (0.3 arcsec) combined Multi-Element Radio-Linked Interferometer Network-Very Large Array observations of their radio continua allow an analysis of the star formation behaviour of these galaxies, on comparable spatial scales to those of the CO observations. This `matched beam' approach sheds light on the spatial distribution of both molecular gas and star formation, and we can therefore calculate accurate star formation rates and gas surface densities: this allows us to place the three systems in the context of a Kennicutt-Schmidt (KS)-style star formation law. We find a difference in size between the
Free Keywords:galaxies: evolution; galaxies: formation; galaxies: ISM; cosmology: observations
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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