Observing water in low-mass proto-stellar outflows: the case of L1448

Details Observing water in low-mass proto-stellar outflows: the case of L1448 Observing water in low-mass proto-stellar outflows: the case of L1448

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.330s&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 will present Herschel observations of water emission towards the outflow driven by the L1448 low-mass proto-stellar system, located in the Perseus cloud (d=300 pc). This outflow has been mapped with the PACS and HIFI instruments, in the 557 GHz and 1670 GHz water lines, as part of the WISH (Water In Star-forming regions with Herschel) key project. Two bright shock spots along the outflow have been also observed in an additional set of ortho and para water lines having different excitation conditions. We present here the obtained maps, in comparison with the maps of other shock tracers, such as CO and SiO, discussing how water appears unique in tracing gas components at intermediate radial velocities (10-40 km/s). We will also discuss the analysis performed on the HIFI observations in the two shock spots, showing strong variations in the excitation as a function of velocity and strong chemical differences among the two investigated positions. These observations thus proved how water is a unique and crucial molecule for our understanding of the physical and chemical conditions in outflows driven by low-mass proto-stars.

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