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A Molecular Ring in the Liner Ngc 5218
Authors:E Olsson  S Aalto  S HÜttemeister
Institution:(1) Onsala Space Observatory & Jodrell Bank Observatory, Onsala, Sweden;(2) Onsala Space Observatory, Onsala, Sweden;(3) Astronomisches Institut der Universität Bochum, Germany
Abstract:High resolution OVRO CO 1–0 observations of the inner 30Prime in the LINER galaxy NGC 5218 reveal the presence of a double centrally peaked molecular concentration with extensions out to a radius of 12Prime. The molecular mass detected is 2.4 × 109 Modot and the gas surface density is high, sim3000 Modot pc square in the inner 500 pc. The SFR is 2–3 Modot yr–1 and the SFE is sim13, which are low or moderate values for that gas surface density. We interpret the inner feature as a rotating molecular ring with a radius of sim 200 pc. We furthermore suggest that the LINER activity in NGC 5218 is not caused by an aging starburst, but by a buried AGN.
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