Poster Presentation

Chemical stratification in the L1448C region

Author(s): Naomi Hirano (ASIAA)

Presenter: Naomi Hirano (ASIAA)

This presentation summarize the distribution and kinematics of molecular lines ofL1448C observed with the SMA in various spectral setting at 230 and 345 GHz. The highly-collimated jets from the northern source, L1448C(N), at extremely high-velocities (EHV) of +/- 50 km/s are seen in the CO, SiO, 29SiO and SO. Dense gas envelopes surrounding two protostars, L1448C(N) and L1448C(S), are traced in the HCN, CS and HCO+. The HCN and CS around L1448C(N) show the line wings having the same blue and red orientation as the outflow/jet, suggesting that these molecules trace the dense gas interacting with the powerful outflow/jet. Especially, the HCN emission reaches to the EHV velocities and shows the secondary peaks similar to those seen in the CO and SiO. On the other hand, the HCO+ line shows rather narrow profile with anomalous velocity pattern; in addition to the blue and redshifted component having the same orientation as the outflow/jet, there is a redshifted component in the blue lobe side and a blueshifted component in the red lobe side. It is likely that the HCO+ emission is tracing the dense gas shell surrounding the CO outflow lobes. The HCN emission at L1448C(S) reveals the broad redshifted wing extending to the EHV velocity. This suggests that the dense gas envelope surrounding L1448C(S) is dynamically interacting with the EHV jet from L1448C(N).