2008ApJ...676.1073C

We present high angular resolution VLA multiepoch continuum observations at 3.6 cm and 7 mm toward the core of the L723 multipolar outflow revealing a multiple system of four radio sources suspected to be YSOs in a region of only ∼4" (1200 AU) in extent. The 3.6 cm observations show that the previously detected source VLA 2 contains a close (separation ≃0.29" or ∼90 AU) radio binary, with components (A and B) along a position angle of ∼150°. The northern component (VLA 2A) of this binary system is also detected in the 7 mm observations, with a positive spectral index between 3.6 cm and 7 mm. In addition, the source VLA 2A is associated with extended emission along a position angle of ∼115°, which we interpret as outflowing shock-ionized gas that is exciting a system of HH objects with the same position angle. A third, weak 3.6 cm source, VLA 2C, which is detected also at 7 mm, is located ∼0.7" northeast of VLA 2A and is possibly associated with the water maser emission in the region. The 7 mm observations reveal the presence of an additional source, VLA 2D, located ∼3.5" southeast of VLA 2A, and with a 1.35 mm counterpart. All these radio continuum sources have a positive spectral index, compatible with them being YSOs. We also propose that the high-velocity CO emission observed in the region could be the superposition of multiple outflows (at least three independent bipolar outflows) excited by the YSOs located at the core, instead of the previous interpretations in terms of only one or two outflows.