Evolution of the Outflow in the Water Fountain Source IRAS 18043-2116
Journal article, 2023

We present the spectral and spatial evolution of H2O masers associated with the water fountain source IRAS 18043-2116, found in observations with the Nobeyama 45 m Telescope and the Australia Telescope Compact Array. We have found new highest-velocity components of the H2O masers (at the redshifted side V (LSR) similar or equal to 376 km s(-1) and at the blueshifted side V (LSR) similar or equal to -165 km s(-1)), and the resulting velocity spread of similar or equal to 540 km s(-1) breaks the speed record of fast jets/outflows in this type of sources. The locations of those components have offsets from the axis joining the two major maser clusters, indicating a large opening angle of the outflow (similar to 60 degrees). The evolution of the maser cluster separation of similar to 2.9 mas yr(-1) and the compact (similar to 0.'' 2) CO emission source mapped with the Atacama Large Millimeter-submillimeter Array suggest a very short (similar to 30 yr) timescale of the outflow. We also confirmed an increase in the flux density of the 22 GHz continuum source. The properties of the jet and the continuum sources and their possible evolution in the transition to the planetary nebula phase are further discussed.

Author

L. Uscanga

Universidad de Guanajuato

H. Imai

Kagoshima University

J. F. Gomez

Spanish National Research Council (CSIC)

Daniel Tafoya

Chalmers, Space, Earth and Environment, Onsala Space Observatory

G. Orosz

Joint Institute for VLBI in Europe (JIVE)

T. P. McCarthy

University of Tasmania

Y. Hamae

Kagoshima University

K. Amada

Kagoshima University

Astrophysical Journal

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

Vol. 948 1 17

Magnetic fields and the outflows during the formation and evolution of stars (OUTFLOWMAGN)

European Commission (EC) (EC/FP7/614264), 2014-05-01 -- 2019-04-30.

Subject Categories

Water Engineering

Astronomy, Astrophysics and Cosmology

Fluid Mechanics and Acoustics

Oceanography, Hydrology, Water Resources

DOI

10.3847/1538-4357/acc06f

More information

Latest update

10/10/2023