Water Vapor around Sgr B2

Details Water Vapor around Sgr B2 Water Vapor around Sgr B2

2006-01-16

arxiv.org/abs/astro-ph/0601336v1

Astrophys.J. 642 (2006) 940-953

Astronomy and Astrophysics

Astrophysics

17 pages, 10 figures (2 of them bitmapped to low resolution), 2 tables, accepted in ApJ, 2006, January 12

Scientific paper

10.1086/501425

We have conducted a study combining H2O lines in two spectral regions. First, Infrared Space Observatory observations of several H2O thermal lines seen in absorption toward Sgr B2(M) at a spectral resolution of 35 kms^-1 have been analyzed. Second, an IRAM-30m telescope map of the para-H2O 3_13-2_20 line at 183.31 GHz, seen in emission, has also been obtained and analyzed. The H2O lines seen in absorption are optically thick and are formed in the outermost gas of the condensations in front of the far-IR continuum sources. They probe a maximum visual extinction of ~5 to 10 mag. Radiative transfer models indicate that these lines are quite insensitive to temperature and gas density, and that IR photons from the dust play a dominant role in the excitation of the involved H2O rotational levels. The water vapor abundance in the region is (1-2)x10^-5. The relatively low H2O/OH abundance ratio in the region, 2-4, is a signature of UV photon dominated surface layers traced by far-IR observations.

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