The Inverse P-Cygni Water Profile of G333.1: Parsec-Scale Infalling Envelope
Abstract
Using the Submillimeter Wave Astronomy Satellite (SWAS), we have obtained a high signal-to-noise and velocity resolved spectrum of the o-H2O 556.936 GHz 110 - 101 transition. The H2O line exhibits a pronounced inverse P-Cygni profile, with absorption present to the redshifted side of the main component by as much as 15 km/s. The J=5-4 transition of 13CO, and the 3P1 - 3P0 transition of CI were observed simultaneously by SWAS. We also obtained complimentary data of CO J=2-1 and C18O J=1-0 at the Swedish-ESO Submillimeter Telescope (SEST). The ground-based data are of higher spatial resolution and reveal cloud components in direct velocity correspondence to those seen in the SWAS H2O spectrum. Based on these observations, we present a cloud model consisting of a hot cloud core and a cool infalling envelope that reproduces all of the major spectral features. It is a rare case of direct observational evidence for large scale infall in a star forming region.
- Publication:
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American Astronomical Society Meeting Abstracts #204
- Pub Date:
- May 2004
- Bibcode:
- 2004AAS...204.9903L