First detections of extragalactic SO2, NS and NO

Details First detections of extragalactic SO2, NS and NO First detections of extragalactic SO2, NS and NO

2003-09-24

arxiv.org/abs/astro-ph/0309663v1

Astron.Astrophys.411:L465-L468,2003

Astronomy and Astrophysics

Astrophysics

Accepted by A&A, 4 pages, 6 figures

Scientific paper

10.1051/0004-6361:20031442

We report the first detections of SO_2, NS and NO in an extragalactic source, the nucleus of the starburst galaxy NGC 253. Five SO_2 transitions, three groups of hyperfine components of NO and five of NS were detected. All three species show large abundances averaged over the inner 200 pc of NGC 253. With a relative abundance of a few 10^-7, the emission of the NO molecule is similar or even larger than that found in Galactic star forming regions. The derived relative molecular abundances for each molecule have been compared with those of prototypical Galactic molecular clouds. These results seem to confirm that large scale shocks dominate the chemistry of these molecules in the nucleus of NGC 253, ruling out a chemistry dominated by PDRs for the bulk of the gas.

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