The ALMA Survey of 70 mu m Dark High-mass Clumps in Early Stages (ASHES). III. A Young Molecular Outflow Driven by a Decelerating Jet
Journal article, 2021

We present a spatio-kinematical analysis of the CO (J = 2 -> 1) line emission, observed with the Atacama Large Millimeter/submillimeter Array (ALMA), of the outflow associated with the most massive core, ALMA1, in the 70 mu m dark clump G010.991-00.082. The position-velocity (PV) diagram of the molecular outflow exhibits a peculiar S-shaped morphology that has not been seen in any other star-forming region. We propose a spatio-kinematical model for the bipolar molecular outflow that consists of a decelerating high-velocity component surrounded by a slower component whose velocity increases with distance from the central source. The physical interpretation of the model is in terms of a jet that decelerates as it entrains material from the ambient medium, which has been predicted by calculations and numerical simulations of molecular outflows in the past. One side of the outflow is shorter and shows a stronger deceleration, suggesting that the medium through which the jet moves is significantly inhomogeneous. The age of the outflow is estimated to be tau approximate to 1300 yr, after correction for a mean inclination of the system of approximate to 57 degrees.

Author

Daniel Tafoya

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Patricio Sanhueza

National Institutes of Natural Sciences

The Graduate University for Advanced Studies (SOKENDAI)

Qizhou Zhang

Harvard-Smithsonian Center for Astrophysics

Shanghuo Li

Chinese Academy of Sciences

Harvard-Smithsonian Center for Astrophysics

Andres E. Guzman

National Institutes of Natural Sciences

Andrea Silva

National Institutes of Natural Sciences

Eduardo de la Fuente

University of Guadalajara

Xing Lu

National Institutes of Natural Sciences

Kaho Morii

University of Tokyo

National Institutes of Natural Sciences

Ken'ichi Tatematsu

National Institutes of Natural Sciences

Yanett Contreras

Leiden University

Natsuko Izumi

Ibaraki University

National Institutes of Natural Sciences

James M. Jackson

NASA Ames Research Center

Fumitaka Nakamura

The Graduate University for Advanced Studies (SOKENDAI)

National Institutes of Natural Sciences

Takeshi Sakai

University of Electro-Communications

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 913 2 131

Subject Categories

Astronomy, Astrophysics and Cosmology

Geophysics

Fluid Mechanics and Acoustics

DOI

10.3847/1538-4357/abf5da

More information

Latest update

6/21/2021