Submillimeter emission from water in the W3 region

C. D. Wilson, A. Mason, E. Gregersen, A. O. H. Olofsson, P. Bergman, R. Booth, N. Boudet, V. Buat, C. L. Curry, P. Encrenaz, E. Falgarone, P. Feldman, M. Fich, H. G. Floren, U. Frisk, M. Gerin, J. Harju, T. Hasegawa, A. Hjalmarson, M. JuvelaN. Tothill

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    Abstract

    Using the Odin satellite, we have mapped the submillimeter emission from the l10-l01 transition of ortho-water in the W3 star-forming region. A 5"² × 5"² map of the W3 IRS4 and W3 IRS5 region reveals strong water lines at half the positions in the map. The relative strength of the Odin lines compared to previous observations by SWAS suggests that we are seeing water emission from an extended region. Across much of the map the lines are double-peaked, with an absorption feature at - 39 km s-1; however, some positions in the map show a single strong line at -43 km s-1. We interpret the double-peaked lines as arising from optically thick, self-absorbed water emission near the W3 IRS5, while the narrower blue-shifted lines originate in emission near W3 IRS4. In this model, the unusual appearance of the spectral lines across the map results from a coincidental agreement in velocity between the emission near W3 IRS4 and the blue peak of the more complex lines near W3 IRS5. The strength of the water lines near W3 IRS4 suggests we may be seeing water emission enhanced in a photon-dominated region.
    Original languageEnglish
    Pages (from-to)L59-L62
    Number of pages4
    JournalAstronomy and Astrophysics
    Volume402
    Issue number3
    DOIs
    Publication statusPublished - 2003

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