High resolution observations of a starburst at z = 0 . 223 : resolved CO ( 1 – 0 ) structure ⋆
نویسنده
چکیده
We present the results of CO(1–0) emission mapping with the IRAM interferometer, at ∼ 1 ′′ resolution, of the z=0.223 ultra-luminous starburst IRAS 11582+3020. This galaxy was selected from an IRAM-30m survey of 30 galaxies at moderate redshift (z ∼ 0.2-0.6) to explore galaxy evolution and in particular the star formation efficiency, 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 between local and high-z ultra-luminous starbursts.
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