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Ja n 20 04 Water Absorption From Line-of-Sight Clouds Toward W 49 A

We have observed 6 clouds along the line-of-sight toward W49A using the Submillimeter Wave Astronomy Satellite (SWAS) and several ground-based observatories. The ortho-H2O 110 → 101 and OH (1665 and 1667 MHz) transitions are observed in absorption, whereas the low-J CO, CO, and CO lines, as well as the [C I] P1− P0 transition, are seen in emission. The emission lines allow us to determine the gas density (n ∼ 1500 − 3000 cm) and CO column densities (N(CO) ∼ 7.9 × 10 − 2.8 × 10 cm) using a standard Large Velocity Gradient analysis. By using both the o-H 2 O and o-H2O absorption lines, we are able to constrain the column-averaged o-H2O abundances in each line-of-sight cloud to within about an order of magnitude. Assuming the standard N(H2)/N(CO) ratio of 10, we find N(o-H2O)/N(H2) = 8.1 × 10 − 4 × 10 for three clouds with optically thin water lines. In three additional clouds, the H2O lines are saturated so we have used observations of the H 2 O ground-state transition to find upper limits to the water abundance of 8.2×10 −1.5×10. We measure Department of Physics & Astronomy, University of Calgary, 2500 University Dr. NW, Calgary, AB,