Three Epochs of Star Formation in the High-Redshift Universe

摘要: We investigate the impact of an early population massive stars on their surroundings. Dissociation molecular hydrogen by strong UV emission from such is expected to produce a global transition in cooling mechanism minihalos at redshift approximately 30, strongly inhibiting star formation until more halos can collapse. Furthermore, chemical enrichment Population III supernovae produces second z ~ 15-20, when mean metallicity universe exceeds critical threshold and gives way II. show that observations high-redshift with Next Generation Space Telescope have potential trace cosmic rate out 20, provided are least as bright as, ideally brighter than, Type Ia supernovae. also propose for novel extremely low intermediate mass very high redshifts, which we term II.5. In our model shock compression, heating, subsequent density reduces fragment primordial gas ~10 M☉, allowing low-mass form. predict number relic II.5 Milky Way halo today find that, certain assumptions, there should be kpc-3 solar neighborhood.