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Too much carbon in NGC253 (1995)

Brand, Peter ; Puxley, Phil ; Harrison, Andrew ; [et al.]

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Publication Date: 2013-08-29

Description: We have observed C(exp 0) across the nucleus of the starburst galaxy NGC253. C(exp 0) is very bright and we find N(C(exp 0))/N(CO) is between 1.5 and 2.3 across the nucleus. Existing PDR models cannot explain the observed C(exp 0) intensity. The size of the observed region seems to rule out 'simultaneous very early time chemistry' across the nucleus. Chemical models in which C(sup 0)/CO is enhanced deep in molecular clouds by large fluxes of cosmic rays also struggle to explain our observations. The most plausible explanation for the observed C(exp 0) is that the C/O elemental ratio is enhanced in NGC253.

Keywords: ASTRONOMY

Type: Astronomical Society of the Pacific, Airborne Astronomy Symposium on the Galactic Ecosystem: From Gas to Stars to Dust, Volume 73; p 185-188

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