Water Abundance in Molecular Cloud Cores

Details Water Abundance in Molecular Cloud Cores Water Abundance in Molecular Cloud Cores

2000-10-19

arxiv.org/abs/astro-ph/0010393v1

ApJ (Letters), 539, L101 (2000)

Astronomy and Astrophysics

Astrophysics

5 pages, 3 Postscript figures, uses aastex.cls, emulateapj5.sty (included), and apjfonts.sty (included)

Scientific paper

10.1086/312848

We present Submillimeter Wave Astronomy Satellite (SWAS) observations of the 1_{10}-1_{01} transition of ortho-water at 557 GHz toward 12 molecular cloud cores. The water emission was detected in NGC 7538, Rho Oph A, NGC 2024, CRL 2591, W3, W3(OH), Mon R2, and W33, and was not detected in TMC-1, L134N, and B335. We also present a small map of the water emission in S140. Observations of the H_2^{18}O line were obtained toward S140 and NGC 7538, but no emission was detected. The abundance of ortho-water relative to H_2 in the giant molecular cloud cores was found to vary between 6x10^{-10} and 1x10^{-8}. Five of the cloud cores in our sample have previous water detections; however, in all cases the emission is thought to arise from hot cores with small angular extents. The water abundance estimated for the hot core gas is at least 100 times larger than in the gas probed by SWAS. The most stringent upper limit on the ortho-water abundance in dark clouds is provided in TMC-1, where the 3-sigma upper limit on the ortho-water fractional abundance is 7x10^{-8}.

Affiliated with

Also associated with

No associations

Rating

Water Abundance in Molecular Cloud Cores does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Water Abundance in Molecular Cloud Cores, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water Abundance in Molecular Cloud Cores will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-396871