1999A&A...350..529N

The spectrum of the Class 0 source L1448-mm has been measured over the wavelength range extending from 6 to 190µm with the Long Wavelength Spectrometer (LWS) and the Short Wavelength Spectrometer (SWS) on the Infrared Space Observatory (ISO). The far infrared spectrum is dominated by strong emission from gaseous H₂O and from CO transitions with rotational quantum numbers J≥14; in addition, the H₂ pure rotational lines S(3), S(4) and S(5), the OH fundamental line at 119µm, as well as emission from [OI]63µm and [CII]158µm are also observed. The strong CO and water emission can be consistently explained as originating in a warm gas component at T∼700-1400K and n_ H₂_~(3-50)x10⁴cm^–3, which fills about 0.2-2% of the ∼75" LWS field of view (corresponding, assuming a single emitting region, to a physical size of about (3-12)" or (0.5-2)x10^–2pc at d=300pc). We derive an H₂O/CO abundance ratio ∼5, which, assuming a standard CO/H₂ abundance of 10^–4, corresponds to H₂O/H₂∼5x10^–4. This value implies that water is enhanced by about a factor ∼10³ with respect to its expected abundance in the ambient gas. This is consistent with models of warm shocked regions which predict that most of the free atomic oxygen will be rapidly converted into water once the temperature of the post-shocked gas exceeds ∼300K. The relatively high density and compact size inferred for this emission may suggest an origin in the shocked region along the molecular jet traced by SiO and EHV CO millimeter line emission. Further support is given by the fact that the observed enhancement in H₂O can be explained by shock conditions similar to those expected to produce the abundant SiO observed in the region. L1448-mm shows the largest water abundance so far observed by ISO amongst young sources displaying outflow activity; we argue that the occurrence of multiple shocks over a relatively short interval of time, like that evidenced in the surroundings of L1448-mm, could have contributed to enrich the molecular jet with a high H₂O column density.