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Very Large H II Regions Around Proto-Clusters of Galaxies During Reionization by Cen, Renyue is a scholarly article available to read on EtoBox.

What is Very Large H II Regions Around Proto-Clusters of Galaxies During Reionization about?

The physical basis for the belief that the abundant old dwarf galaxies seen in present-day galaxy clusters formed before reionization of the universe is very compelling, because (1) the observed faint end slope of the galaxy luminosity function ascends from a shallower slope at brighter magnitudes and tracks that of dark matter halo mass function, and (2) that steep power-law slope is observed to extend all the way to galaxies of inferred velocity dispersion of ~10km/s. We then show that the number of ionizing photons emitted by these dwarf galaxies should be able to produce an H II region at least as large as each proto-cluster region, occupying at least 20% of the entire IGM volume at z >= 6. A more likely scenario is that our estimate of the ionizing photon production rate based on these dwarfs under-estimates the true rate from proto-clusters by a factor of ~5 for a variety of physically plausible reasons, in which case a fully self- consistent picture emerges. Specific implications include (1) Strong clustering of sources would collectively produce very large individual H II regions of sizes up to ~100Mpc before overlapping with others, having important implications for upcomi

Author

Cen, Renyue

Published

2005

Language

EN