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Reionization
[Moderator's note: Apologies for the delay in posting this. -P.H.]
Not long ago, we had some discussion here of reionization. I've just seen a terrific colloquium by Steve Finkelstein on the subject. It's available at https://www.youtube.com/watch?v=RnDAHN3yL0Q Some of the acronyms go by pretty fast, but I think most interested readers can follow the basic points. Steve presents his own preferred model, which may or may not be right, but he also summarizes what is known for sure from observations. Steve's preferred model is interesting. Most of the ionizing photons come from large numbers of very low luminosity galaxies (absolute magnitudes -12 to -13). Those galaxies are not directly observable, but because they are low mass, they form early, and the start of reionization is correspondingly early (around z=12 with 50% of the volume ionized by z=9). If that's correct, it ought to be detectable with a variety of upcoming observations, some of which he discusses. -- Help keep our newsgroup healthy; please don't feed the trolls. Steve Willner Phone 617-495-7123 Cambridge, MA 02138 USA |
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