TL;DR
This review summarizes the current understanding of Balmer-dominated shocks in astrophysics, covering theory, observations, and their significance in cosmic ray acceleration and electron-ion temperature equilibration.
Contribution
It provides a comprehensive synthesis of recent theoretical models and observational data on BDSs, highlighting their importance in various astrophysical contexts.
Findings
BDSs observed in multiple supernova remnants.
Models with and without shock precursors are discussed.
BDSs are relevant for understanding cosmic ray acceleration.
Abstract
A concise and critical review of Balmer-dominated shocks (BDSs) is presented, summarizing the state of theory and observations, including models with/without shock precursors and their synergy with atomic physics. Observations of BDSs in supernova remnants are reviewed on an object-by-object basis. The relevance of BDSs towards understanding the acceleration of cosmic rays in shocks is emphasized. Probable and possible detections of BDSs in astrophysical objects other than supernova remnants, including pulsar wind nebulae and high-redshift galaxies, are described. The case for the continued future of studying BDSs in astrophysics is made, including their relevance towards understanding electron-ion temperature equilibration in collisionless shocks.
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