  We report new results on outflow and infall in the star forming cores W3-SE
SMA-1 and SMA-2 based on analysis of $\sim2.5\arcsec$ resolution observations
of the molecular lines HCN(3-2), HCO$^+$(3-2), N$_2$H$^+$(3-2) and
CH$_3$OH(5$_{2,3}-4_{1,3}$) with the Submillimeter Array. A high-velocity
bipolar outflow originating from the proto-stellar core SMA-1 was observed in
the HCN(3-2) line, with a projected outflow axis in position angle 48$\arcdeg$.
The detection of the outflow is confirmed from other molecular lines. An
inverse P-Cygni profile in the HCN(3-2) line toward SMA-1 suggests that at
least one of the double cores accretes matters from the molecular core. A
filamentary structure in the molecular gas surrounds SMA-1 and SMA-2. Based on
the SMA observations, our analysis suggests that the double pre-stellar cores
SMA-1 and SMA-2 result from fragmentation in the collapsing massive molecular
core W3-SE, and it is likely that they are forming intermediate to high-mass
stars which will be new members of a star cluster in the W3-SE region.

Solar and Stellar Astrophysics