English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this work we aimed to describe the three-dimensional morphology andkinematics of the molecular gas of the water-fountain nebula IRAS 16342-3814.In order to do this, we retrieved data from the ALMA archive to analyse itusing a simple spatio-kinematical model. We used the software SHAPE toconstruct a three-dimensional spatio-kinematical model of the molecular gas inIRAS 16342-3814. By reproducing the intensity distribution andposition-velocity diagram of the CO emission from the ALMA observations wederived the morphology and velocity field of the gas. We used CO(1-0) data tosupport the physical interpretation of the model. A spatio-kinematical modelthat includes a high-velocity collimated outflow embedded within materialexpanding at relatively lower velocity reproduces the images andposition-velocity diagrams from the observations. The high-velocity collimatedoutflow exhibits deceleration across its length, while the velocity of thesurrounding component increases with distance. The morphology of the emittingregion; the velocity field and the mass of the gas as function of velocity arein excellent agreement with the properties predicted for a molecular outflowdriven by a jet. The timescale of the molecular outflow is estimated to be~70-100 years. An oscillating pattern was found associated to the high-velocitycollimated outflow. The oscillation period of the pattern is T~60-90 years andits opening angle is ~2 degrees. The CO (3-2) emission in IRAS 16342-3814 isinterpreted in terms of a jet-driven molecular outflow expanding along anelongated region. The position-velocity diagram and the mass spectrum reveal afeature due to entrained material that is associated to the driving jet. It islikely that the jet in those objects has already disappeared since it isexpected to last only for a couple of hundred years.

Spatio-kinematical model of the collimated molecular outflow in the water-fountain nebula IRAS 16342-3814