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2000ApJ...539L.111N - Astrophys. J., 539, L111-L113 (2000/August-3)

Observations of absorption by water vapor toward Sagittarius B2.

NEUFELD D.A., ASHBY M.L.N., BERGIN E.A., CHIN G., ERICKSON N.R., GOLDSMITH P.F., HARWIT M., HOWE J.E., KLEINER S.C., KOCH D.G., PATTEN B.M., PLUME R., SCHIEDER R., SNELL R.L., STAUFFER J.R., TOLLS V., WANG Z., WINNEWISSER G., ZHANG Y.F. and MELNICK G.J.

Abstract (from CDS):

We have observed the 110-101 pure rotational transitions of both H216O and H218O toward Sagittarius B2 using the Submillimeter Wave Astronomy Satellite. The spectra thereby obtained show a complex pattern of absorption and–in the case of H216O-emission, with numerous features covering a wide range of LSR velocities (-130 to 130 km.s–1) and representing absorption both in gas associated with Sgr B2 as well as by several components of foreground gas along the line of sight. The ortho-water abundance derived for the absorbing foreground gas is ∼6x10–7 relative to H2.

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Journal keyword(s): ISM: Abundances - ISM: Clouds - ISM: Individual: Name: Sagittarius B2 - ISM: Molecules - Radio Lines: ISM

Simbad objects: 4

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