A Molecular Ring in the Liner Ngc 5218 |
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Authors: | E. Olsson S. Aalto S. HÜttemeister |
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Affiliation: | (1) Onsala Space Observatory & Jodrell Bank Observatory, Onsala, Sweden;(2) Onsala Space Observatory, Onsala, Sweden;(3) Astronomisches Institut der Universität Bochum, Germany |
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Abstract: | High resolution OVRO CO 1–0 observations of the inner 30 in the LINER galaxy NGC 5218 reveal the presence of a double centrally peaked molecular concentration with extensions out to a radius of 12. The molecular mass detected is 2.4 × 109 M and the gas surface density is high, 3000 M pc square in the inner 500 pc. The SFR is 2–3 M yr–1 and the SFE is 13, 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 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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