Numerical Models of Externally Irradiated Herbig–Haro Objects

We use 3D radiation–hydrodynamic simulations to study the effects of an external photoionization source on the structure of a Herbig–Haro (HH) jet launched from a young stellar object. Different ionizing photon rates are considered as well as a time-dependent ejection velocity and density. From our...

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Bibliographic Details
Published in:The Astrophysical journal 2021-09, Vol.918 (2), p.75
Main Authors: Estrella-Trujillo, D., Velázquez, P. F., Raga, A. C., Esquivel, A.
Format: Article
Language:English
Subjects:
Astrophysics
Computational methods
Density
Ejection
Emission analysis
H alpha line
Herbig-Haro objects
Interstellar medium
Jets
Mathematical models
Morphology
Numerical models
Outflow
Photoionization
Radiation
Stellar jets
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Summary:We use 3D radiation–hydrodynamic simulations to study the effects of an external photoionization source on the structure of a Herbig–Haro (HH) jet launched from a young stellar object. Different ionizing photon rates are considered as well as a time-dependent ejection velocity and density. From our numerical results, synthetic H α emission maps are computed in order to study how the external ionizing source affects the observed morphology of the jet and counterjet. We find that, as expected, the outflow has jet/counterjet and side-to-side asymmetries (with brighter H α emission toward the external photoionizing source). We find that, for a variable ejection velocity, jet morphologies similar to different observed externally irradiated jets can be straightforwardly obtained. Models of jets with a variable ejection density (and constant outflow velocity) produce morphologies that are not seen in observed HH jets and are, therefore, not justified by the presently available observations.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac1122