Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2012-02-07
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
7 pages, 9 figures, accepted for publication in Astronomy and Astrophysics
Scientific paper
Outflows generated by protostars heavily affect the kinematics and chemistry of the hosting molecular cloud through strong shocks that enhance the abundance of some molecules. L1157 is the prototype of chemically active outflows, and a strong shock, called B1, is taking place in its blue lobe between the precessing jet and the hosting cloud. We present the Herschel-PACS 55--210 micron spectra of the L1157-B1 shock, showing emission lines from CO, H2O, OH, and [OI]. The spatial resolution of the PACS spectrometer allows us to map the warm gas traced by far-infrared (FIR) lines with unprecedented detail. The rotational diagram of the high-Jup CO lines indicates high-excitation conditions (Tex ~ 210 +/- 10 K). We used a radiative transfer code to model the hot CO gas emission observed with PACS and in the CO (13-12) and (10-9) lines measured by Herschel-HIFI. We derive 200
Benedettini Milena
Busquet Gemma
Cabrit Silvie
Ceccarelli Cecilia
Cernicharo Jose
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