2023A&A...677A..80W -
Astronomy and Astrophysics, volume 677A, 80 (2023/9-1)
ALMA and VLBA views on the outflow associated with an O-type protostar in G26.50+0.28.
WU G., HENKEL C., XU Y., BRUNTHALER A., MENTEN K.M., QIU K., LI J., ZHANG B. and ESIMBEK J.
Abstract (from CDS):
Protostellar jets and outflows are essential ingredients of the star formation process. A better understanding of this phenomenon is important in its own right as well as for many fundamental aspects of star formation. Jets and outflows associated with O-type protostars are rarely studied with observations reaching the close vicinity of the protostars. In this work, we report high-resolution ALMA and VLBA observations to reveal a clear and consistent picture of an outflow associated with an O-type protostar candidate in the G26.50+0.28 region. These observations reveal, for the first time, a collimated jet located in the middle of the outflow cavity. The jet is found to be perpendicular to an elongated disk/toroid and its velocity gradient. The collimated jet appears to show a small amplitude (α≈0°.06) counterclockwise precession, when looking along the blueshifted jet axis from the strongest continuum source MM1, with a precession length of 0.22 pc. The inclination of the jet is likely to be very low (≈8°), which makes it a promising target to study its transverse morphologies and kinematics. However, no clear evidence of jet rotation is found in the ALMA and VLBA observations. The three-dimensional velocities of the water maser spots appear to show the same absolute speed with respect to different opening angles, suggesting the jet winds may be launched in a relatively small region. This favors the X-wind model, that is, jets are launched in a small area near the inner disk edge.
Abstract Copyright:
© The Authors 2023
Journal keyword(s):
ISM: individual objects: G26.50+0.28/IRAS 18360-0537 - ISM: jets and outflows - stars: formation - masers - radio lines: ISM
Simbad objects:
6
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