Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914305j&link_type=abstract
American Astronomical Society, AAS Meeting #219, #143.05
Astronomy and Astrophysics
Astronomy
Scientific paper
The possibility of observable spectral disturbances in the Cosmic Microwave Background (CMB) due to non-LTE effects in hydrogen recombination lines (in particular, maser amplification) produced during the epoch of reionization is re-visited. Such effects have been discovered in galactic HII regions and thoroughly studied theoretically. During the epoch of reionization, similar effects can, in principle, arise in large HII regions surrounding the first massive stars, star clusters and quasars. However, the theory developed for contemporary HII regions is not directly applicable to the HII regions of the reionization epoch because there is a considerably stronger (black-body) radiation background that tends to thermalize hydrogen transitions with high principal quantum numbers. We discuss the limitations due to radiative thermalization for possible non-LTE effects, as well as the anticipated frequencies and angular sizes of possible disturbances in the CMB. This project was supported by NSF/REU grant AST-0851892 and the Nantucket Maria Mitchell Association.
Jaye Redmond Kayla
Strelnitski Vladimir
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