Weak and Compact Radio Emission in Early Massive Star Formation Regions:   An Ionized Jet Toward G11.11-0.12P1
  We report 1.3 cm and 6 cm continuum observations toward the massive proto-stellar candidate G11.11-0.12P1 using the Karl G. Jansky Very Large Array (VLA). We detect a string of four unresolved radio continuum sources coincident with the mid-IR source in G11P1. The continuum sources have positive spectral indices consistent with a thermal (free-free) ionized jet. The most likely origin of the ionized gas are shocks due to the interaction of a stellar wind with the surrounding high-density material. We also present NIR United Kingdom Infrared Telescope (UKIRT) archival data which show an extended structure detected only at K-band (2.2 $\mu$m), which is oriented perpendicular to the jet, and that may be scattered light from a circumstellar disk around the massive protostar. Our observations plus the UKIRT archival data thus provide new evidence that a disk/jet system is present in the massive protostellar candidate located in the G11.11-0.12P1 core. 
V. Rosero, P. Hofner, M. McCoy, S. Kurtz, K. M. Menten, F. Wyrowski,   E. D. Araya, L. Loinard, C. Carrasco-Gonz\'alez, L. F...
astro-ph.SR