The powering source and origin of the quadrupolar molecular outflow in L723

We present the results of single-dish observations of CS J = 2-1 and J = 3- 2 and interferometric observations of CO J = 1-0 toward the center of the q uadrupolar molecular outflow in L723. We have detected a compact CS condens ation having a size of 0.04 pc and a mass of 0.55 M. toward the northeaster n radio continuum source VLA 2 (AER91 2). The CO outflow also shows the dis tribution centered at VLA 2. These results suggest that the source VLA 2 is the young stellar object that is powering the conspicuous molecular outflo w system. On the other hand, there is no enhancement in the CS intensity or the CO outflow distribution toward the southwestern radio continuum source VLA 1 (AER91 1), indicating that the source VLA I does not contribute to t he morphology of the quadrupolar outflow in L723. The CO distribution observed with the interferometer delineates the western edge of the blue lobe and the northeastern edge of the red lobe revealed i n the single-dish map, suggesting that the outflow in L723 is a single bipo lar outflow with a wide opening angle of 120 degrees-170 degrees rather tha n two independent outflows. We found signs of interaction between the blues hifted outflow and the dense ambient gas: (1) there is a compact CS clump b lueshifted by similar to 1 km s(-1), the distribution of which shows antico rrelation with the blueshifted CO outflow; (2) both CS and NH3 spectra show the line broadening toward the blueshifted clump; and (3) there is a tempe rature enhancement at the boundary of the blueshifted clump of CS emission. It is likely that such interaction with the dense ambient gas has the incr eased opening angle of the outflow, which accounts for the quadrupolar morp hology.