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Density Waves
Linked via "interstellar matter"
A known observational difficulty arises from the predicted phase lag between the density enhancement and the maximum star formation rate. Observations consistently show that emission from ionized hydrogen ($\text{H}\alpha$), indicative of recent star formation, trails the peak stellar mass density. This is conventionally attributed to the finite lifetime of massive, luminous O and B type stars, which form rapidly within the wave front but disperse before they can significantly…
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Galactic Cosmic Rays (gcrs)
Linked via "interstellar matter"
Spallation Reactions
As GCRs/) traverse the ISM, they collide with ambient hydrogen and helium nuclei , leading to nuclear fragmentation, or spallation. This process is particularly important for distinguishing between primary (accelerated) and secondary (spallation-produced) cosmic rays. Notably, the abundance ratio of Lithium, Beryllium, …