Widespread far-infrared absorption of CH, OH and H2O in Sgr B2

Details Widespread far-infrared absorption of CH, OH and H2O in Sgr B2 Widespread far-infrared absorption of CH, OH and H2O in Sgr B2

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..655c&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 655

Computer Science

4

Molecular Clouds, Sgr B2, Molecules, Molecular Abundances

Scientific paper

We present LWS-grating and LWS-FP data of the SgrB2 molecular cloud. Two full LWS-grating rasters, centred on SgrB2 and giving a total of 19 positions, have been obtained. In addition, a 7x7 position raster, with an angular separation of 90 arcsec, has been performed with the LWS-FP in the 179.5 μm line of H2O and the 119.5 μm line of OH. Taking into account the H2O map analysed by Cernicharo et al. (1997), the present data indicates that water vapour is abundant in the direction of SgrB2 in a region as large as half a degree (i.e., about 80 parsecs in size). In all observed positions there is a line in absorption at 181 μm that we believe to be the 212-101 of H218O at 181.053 μm. The water abundance derived from these data is ~=10-5. The FP map around SgrB2 indicates that the line profile changes from point to point suggesting important variations in the excitation conditions. The OH lines absorb completely the continuum emission in all observed positions. CH has been detected in all the positions observed with the grating. In addition, in the central position we have performed a search of several rotational lines of this molecule with the FP. Only the fundamental line was detected suggesting that CH is only abundant in the external parts of the cloud where collisions are not important enough to populate the high-J levels of CH. The averaged CH column density in our map is very similar to that found by Stacey et al. (1987) with the KAO in the direction of SgrB2. Several ro-vibrational lines of triatomic carbon, C3, have been also detected towards the central position of the cloud.

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