ISO spectroscopy of OH in the starburst galaxy NGC 253

Details ISO spectroscopy of OH in the starburst galaxy NGC 253 ISO spectroscopy of OH in the starburst galaxy NGC 253

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..861b&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 861

Computer Science

11

Galaxies: Starburst - Galaxies: Individual: Ngc 253 -, Galaxies: Ism - Molecules: Oh

Scientific paper

Using the ISO LWS and SWS gratings we have detected five far-IR rotational transitions of the OH molecule in the starburst galaxy NGC 253. These detections, including all four transitions connecting to the ground state, allow a determination of the OH column density and abundance, and constrain the distributions of molecular gas and warm dust in NGC 253's nuclear starburst. A simple radiative excitation-deexcitation scheme approximately reproduces the observed fluxes in emission and absorption for the 4 optically thin transitions. For the optically thick 119 μm doublet, we have obtained a velocity-resolved profile with the LWS Fabry-Perot, which shows both absorption, and high velocity component in emission, possibly related to a large molecular cloud

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