Observations of absorption by water vapor toward Sagittarius B2

Authors

DA Neufeld
MLN Ashby
EA Bergin
G Chin
NR Erickson, University of Massachusetts - AmherstFollow
PF Goldsmith
M Harwit
JE Howe
SC Kleiner
DG Koch
BM Patten
R Plume
R Schieder
Ronald L. Snell, University of Massachusetts - AmherstFollow
JR Stauffer
V Tolls
Z Wang
G Winnewisser
YF Zhang
GJ Melnick

Publication Date

2000

Journal or Book Title

ASTROPHYSICAL JOURNAL

Abstract

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 ~6 × 10^-7 relative to H₂.

Comments

The published version is located at http://iopscience.iop.org/1538-4357/539/2/L111

DOI

https://doi.org/10.1086/312853

Pages

L111-L113

Volume

539

Issue

2

Recommended Citation

Neufeld, DA; Ashby, MLN; Bergin, EA; Chin, G; Erickson, NR; Goldsmith, PF; Harwit, M; Howe, JE; Kleiner, SC; Koch, DG; Patten, BM; Plume, R; Schieder, R; Snell, Ronald L.; Stauffer, JR; Tolls, V; Wang, Z; Winnewisser, G; Zhang, YF; and Melnick, GJ, "Observations of absorption by water vapor toward Sagittarius B2" (2000). ASTROPHYSICAL JOURNAL. 635.
https://doi.org/10.1086/312853