EPoS Contribution
EPoS Contribution
A highly collimated flow from a high-mass protostar

Tatiana Rodriguez
NMT, Socorro, US
ISOSS J23053+5953 SMM2 is a rare example of a high-mass protostar in the phase of rapid mass accretion, but still before the formation of a prominent hot core region. Located at a distance of ~3.5 kpc, in a molecular core of mass 26 Msol within 8000 AU, it shows clear signs of mass infall at a rate of 2×10-3 Msol/yr, and its age is estimated to be ~5000 yrs. A prominent NH3 velocity gradient across the core suggests that this object formed by the convergence of two molecular filaments. We have recently used the SMA to perform CO(2-1) observations toward ISOSS J23053+5953 SMM2 and detected a highly collimated outflow (see Figure below). Our JVLA continuum data reveal the presence of compact ionized gas at the center of the core, likely arising from a thermal jet from the high-mass protostar. In this presentation, we will discuss the nature of the jet-outflow system in this extremely young high-mass protostar, and its implications for high-mass star formation theories.
Caption: Left: Herschel 70 μm image of ISOSS J23053+5953. Black contours: 1.3 mm continuum, blue and red contours: 12CO(2-1). A highly collimated flow is detected from the high-mass protostellar candidate SMM2. Right: expanded view of the SMM2 region. The 3.6 cm continuum emission is shown in color scale and the black contours show the 1.3 mm continuum emission. VLA observations show compact 3.6 cm emission in the center of the core, likely arising from an ionized jet.
Collaborators:
P. Hofner, NMT, US
H. Linz, MPIA, DE
E. Araya, WIU, US
R. Cesaroni, Arcetri, IT
Q. Zhang, CfA, US
S. Kurtz, IRyA/UNAM, MX
V. Rosero, NRAO, US
Suggested Session: High-Mass Star Formation