Shocks in the warm neutral medium I -- Theoretical model

TL;DR

This paper develops a theoretical model to analyze shocks in the Warm Neutral Medium, aiming to identify observational tracers and predict shock signatures relevant for understanding interstellar medium dynamics.

Contribution

It introduces an updated multi-fluid shock model for the WNM that incorporates self-irradiation effects, advancing the theoretical understanding of shock properties in this medium.

Findings

Identification of key shock tracers in the WNM

Predictions of emission line signatures from shocks

Insights into phase transitions between WNM and CNM

Abstract

Context. Atomic and molecular line emissions from shocks may provide valuable information on the injection of mechanical energy in the interstellar medium (ISM), the generation of turbulence, and the processes of phase transition between the Warm Neutral Medium (WNM) and the Cold Neutral Medium (CNM).Aims. In this series of papers, we investigate the properties of shocks propagating in the WNM. Our objective is to identify the tracers of these shocks, use them to interpret ancillary observations of the local diffuse matter, and provide predictions for future observations.Methods. Shocks propagating in the WNM are studied using the Paris-Durham shock code, a multi-fluid model built to follow the thermodynamical and chemical structures of shock waves, at steady-state, in a plane-parallel geometry. The code, already designed to take into account the impact of an external radiation field, is updated to treat self-irradiated shocks at intermediate (30