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
Artikel i vetenskaplig tidskrift, 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.

Författare

Daniel Tafoya

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium, Observationssupport

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

Universidad de 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

Universiteit Leiden

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

Ämneskategorier

Astronomi, astrofysik och kosmologi

Geofysik

Strömningsmekanik och akustik

DOI

10.3847/1538-4357/abf5da

Mer information

Senast uppdaterat

2021-06-21