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Missing Baryons
By coincidence, I ran across a recent paper discussing the "missing
baryon" problem: https://doi.org/10.1002/asna.201713343 [[Mod. note -- I've fixed the slightly-garbled DOI URL. The article itself is paywalled, but the preprint is on the arXiv: https://arxiv.org/abs/1611.03722 -- jt]] Don't overlook that Fig 1 double-counts some small but unknown amount of the hot gas, as noted in the figure caption. In other words, the combined red and green sectors should be a little smaller than shown. An upcoming _Nature_ paper by the same lead author will suggest that most or all of the missing baryons are in the form of very hot intergalactic gas, detected as O VII. That is difficult but not quite impossible to observe with current instruments. Future X-ray observatories should give much better information. -- 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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