Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.548s&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
The first sources of ionizing radiation which turned on in the postrecombination universe exerted a strong feedback on the subsequent formation and evolution of galaxies. Included in these effects was the reionization of the intergalactic medium by the propagation of overlapping ionization fronts, which photoevaporated some protogalactic clouds and altered the thermal history of the gas inside others. The role of hydrogen molecules in cooling primordial gas inside protogalaxies and thereby initiating gravitational instability and primordial star formation was also affected by this radiation, both negatively as a result of photodissociation fronts and positively as a result of the enhanced ionization level and its contribution to molecule formation. We will discuss new results in the study of these gas dynamical processes.
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