Water emission towards the chemical rich outflow L1157: the WISH spectral line survey.

Details Water emission towards the chemical rich outflow L1157: the WISH spectral line survey. Water emission towards the chemical rich outflow L1157: the WISH spectral line survey.

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.368v&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

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Scientific paper

We present the results of the Herschel-HIFI water line survey performed in two bow shock regions (B2 and R) towards L1157, the prototype of chemically rich outflows. Observations, obtained as part of the WISH key project, cover several H2O ortho and para transitions in the frequency range from 500 to 1700 GHz. We will show the interestingly distinct behaviour of water profiles in the two positions, B2 and R, and how the R clump shows a clear dependence of excitation with velocity. We also compare H_2O line profiles with other molecules that trace different physical conditions (such as CH_3OH, CS, C18O, NH_3). Differently from other species such as ammonia, formaldehyde, and methanol that trace only the lower outflow velocities, water also traces higher velocities suggesting different formation routes. We will exhibit a comparison of H_2O with a standard jet-tracer, SiO, where it is clear that, although both species are tracing the same velocity range, the two profiles display a clear discrepancy challenging present theoretical models. A water LVG analysis, where we constrain the multi component physical conditions, is also provided.

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