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Based on observations of the most abundant sulfur-bearing molecules (H2S, CS,NS, SO, H2CS, OCS, and SO2) carried out with the IRAM 30m telescope and SEST,we present the first analysis of the sulfur chemistry of an extragalacticsource, the nuclear region of the starburst galaxy NGC 253. This is the firsttime that H2S and, tentatively, H2CS are detected towards the nucleus of astarburst galaxy. Source averaged fractional abundances of these molecules area few 10^-9, except for CS and OCS which are more abundant (10^-8). Sulfurisotopic ratios, 32S/34S~8+-2 and 34S/33S>9, are measured through observationsof 13CS, C34S, and C33S. A comparison with the observed relative abundancestowards different prototypical Galactic sources suggests that the chemicalcomposition of NGC 253 is similar to that found towards the molecular cloudscomplexes like Sgr B2 in the nuclear region of the Milky Way. The largeoverabundance of OCS compared to the predictions of time-dependent sulfurchemistry models supports the idea that OCS is likely injected into the gasphase from the grain mantles by low velocity shocks.Comment: Accepted for publication in ApJ. 19 pages, 3 figure

Sulfur Chemistry and Isotopic Ratios in the Starburst Galaxy NGC 253