The 2 mm line survey of the starburst galaxy NGC 253: sulfur chemistry

Details The 2 mm line survey of the starburst galaxy NGC 253: sulfur chemistry The 2 mm line survey of the starburst galaxy NGC 253: sulfur chemistry

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..297m&link_type=abstract

In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A

Computer Science

Starburst Galaxies, Chemistry, Sulfur

Scientific paper

The unbiased spectral line survey in the 2mm atmospheric window towards the nucleus of the starburst galaxy NGC 253 is presented. As a result of this frequency scan a number of molecular species, not previously observed in the extragalactic ISM, have been detected. Four out of these detections correspond to sulfur bearing molecules, namely SO2, H2S, H2CS and NS. Altogether with observations of CS, SO, OCS, SO2 , H2CS, H2S and NS are of a few 10-9, those of CS and OCS we are able to characterize the sulfur chemistry of this extragalactic source. Observed abundances are compared with selected prototypical Galactic sources. The similarity between the abundance ratios measured in NGC 253 and those in the molecular cloud complexes in the Galactic center suggests that large scale low velocity shocks are the main mechanism heating and driving the chemistry in its nucleus.

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