A Tail of Two Clumps

Alejandro Cristian Raga,Liliana Hernández-Martínez,Jorge Cantó,Antonio Castellanos-Ramírez,Pedro Rivera-Ortíz,Jorge Ivan Castorena,Ary Rodríguez-González

doi:10.3390/galaxies10010019

Alejandro Cristian Raga, Liliana Hernández-Martínez + Show 5 more

Open Access

https://doi.org/10.3390/galaxies10010019

Copy DOI

Journal: Galaxies	Publication Date: Jan 21, 2022
Citations: 1	License type: CC BY 4.0

Affiliation: Universidad Nacional Autónoma de México

Abstract

We present two axisymmetric simulations of a high velocity clump in a photoionized region: one for the case of a uniform, low density environment and a second one for the case of a clump first traveling within a high density medium and then emerging into a low density environment. We show that the second scenario results in the production of an axial tail of dense material with a linear velocity vs. position ramp (with zero velocity at the high/low density environment transition). This material comes from a confined bow shock (produced by the clump when it was within the dense cloud) that emerges into the low environmental density region.

Highlights

Rodríguez-González, A.; Rivera-Ortíz, In different astrophysical objects, we find “fast clump” or “interstellar bullet” flows with a long tail of material with linearly decreasing velocities towards the outflow source.For example, this kind of flow is found in planetary nebulae (PNe) or in proto-planetary nebulae (PPNe).Modelling high speed “bullet” flows in terms of winds, jets and clumps ejected from the central source has been presented by [4,5]
In order to show that this is the case, we have computed axisymmetric numerical simulations of a dense, high velocity clump traveling in a low density environment and of a clump first traveling in a high density environment and emerging into a low density medium
We have presented a model for the production of clumps with a linear velocity vs

Summary

Introduction

Rodríguez-González, A.; Rivera-Ortíz, In different astrophysical objects, we find “fast clump” or “interstellar bullet” flows with a long tail of material with linearly decreasing velocities towards the outflow source. In order to show that this is the case, we have computed axisymmetric numerical simulations (with the setup described in Section 2) of a dense, high velocity clump traveling in a low density environment and of a clump first traveling in a high density environment and emerging into a low density medium. The results of these simulations are described, and predictions of Hα emission maps and position-velocity (PV).

The Numerical Simulations

Results

Intensity Maps and PV Diagrams

Discussion