Late reionization by supernova-driven winds

Details Late reionization by supernova-driven winds Late reionization by supernova-driven winds

1993-06-23

arxiv.org/abs/astro-ph/9306021v2

Astrophys.J.417:54,1993

Astronomy and Astrophysics

Astrophysics

29 pages, incl 6 figures. Stone-age postscript replaced by LATeX. Latest version at http://www.sns.ias.edu/~max/gp.html (faste

Scientific paper

10.1086/173290

A model is presented in which supernova-driven winds from early galaxies reionize the intergalactic medium by z=5. This scenario can explain the observed absence of a Gunn-Peterson trough in the spectra of high-redshift quasars providing that the bulk of these early galaxies are quite small, no more massive than about 10^8 solar masses. It also predicts that most of the IGM was enriched to at least 10% of current metal content by z=5 and perhaps as early as z=15. The existence of such early mini-galaxies violates no spectral constraints and is consistent with a pure CDM model with b<2. Since the final radius of a typical ionized bubble is only around 100 kpc, the induced modification of the galaxy autocorrelation function is negligible, as is the induced angular smoothing of the CMBR. Some of the gas swept up by shells may be observable as pressure-supported Lyman-alpha forest clouds.

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