Radiative Feedback from the First Objects and the End of the Cosmological Dark Age

Details Radiative Feedback from the First Objects and the End of the Cosmological Dark Age Radiative Feedback from the First Objects and the End of the Cosmological Dark Age

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ap%26ss.269..191h&link_type=abstract

Astrophysics and Space Science, v. 269/270, p. 191-199 (1999).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

In hierarchical models of structure formation, an early cosmic UV background (UVB) is produced by the small (T_vir <~ 10^4K) halos that collapse before cosmological reionization. If the sources in the first collapsed halos are stars, then their UV flux below 13.6 eV photo-dissociates the molecular hydrogen H_2 in subsequently collapsing halos and causes a pause in the cosmic star-formation history. The buildup of the UVB, and reionization is delayed until larger halos (T_vir >~ 10^4K) collapse. In contrast, if the small halos host mini-quasars with hard spectra extending to ~1keV, then their X-rays balance the effects of the UVB, the negative feedback does not occur, and reionization can be caused early on by the small halos.

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