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Issue A&A
Volume 460, Number 3, December IV 2006
Page(s) L49 - L52
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20066559



A&A 460, L49-L52 (2006)
DOI: 10.1051/0004-6361:20066559

Letter

High resolution observations of a starburst at z = 0.223: resolved CO(1-0) structure

F. Combes1, S. García-Burillo2, J. Braine3, E. Schinnerer4, F. Walter4, L. Colina5, and M. Gerin6

1  Observatoire de Paris, LERMA (CNRS: UMR8112), 61 Av. de l'Observatoire, 75014, Paris, France
    e-mail: francoise.combes@obspm.fr
2  Observatorio Astronómico Nacional (OAN), Observatorio de Madrid, Alfonso XII, 3, 28014 Madrid, Spain
3  Observatoire de Bordeaux, Université Bordeaux I, BP 89, 33270 Floirac, France
4  Max-Planck-Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
5  IEM, Consejo Superior de Investigaciones Cientificas (CSIC), Serrano 121, 28006 Madrid, Spain
6  Radioastronomie ENS, 24 rue Lhomond, 75005 Paris, France

(Received 13 October 2006 / Accepted 27 October 2006 )

Abstract
We present the results of mapping the CO(1-0) emission of the z=0.223 ultra-luminous starburst IRAS 11582+3020, with the IRAM interferometer, at ~1´´ resolution. This galaxy was selected from an IRAM-30 m survey of 30 galaxies at moderate redshift ( $z \sim 0.2{-}0.6$) to explore galaxy evolution and, in particular, the efficiency of star formation, in the redshift range filling the gap between local and very high-z objects. The CO emission is kinematically resolved, and about 50% of the total emission found in the 27´´ (97 kpc) single dish beam is not recovered by the interferometer. This indicates that some extended emission may be present on large scales (typically 7-15´´). The FIR-to-CO luminosity ratio follows the trend from local to high-z ultra-luminous starbursts.


Key words: galaxies: general -- galaxies: high redshift -- galaxies: ISM -- galaxies: starburst -- radio lines: galaxies



© ESO 2006


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