The mass of the missing baryons in the X-ray forest of the warm-hot intergalactic medium

Details The mass of the missing baryons in the X-ray forest of the warm-hot intergalactic medium The mass of the missing baryons in the X-ray forest of the warm-hot intergalactic medium

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005natur.433..495n&link_type=abstract

Nature, Volume 433, Issue 7025, pp. 495-498 (2005).

Mathematics

Logic

122

Scientific paper

Recent cosmological measurements indicate that baryons comprise about four per cent of the total mass-energy density of the Universe, which is in accord with the predictions arising from studies of the production of the lightest elements. It is also in agreement with the actual number of baryons detected at early times (redshifts z > 2). Close to our own epoch (z < 2), however, the number of baryons detected add up to just over half (~ 55 per cent) of the number seen at z > 2 (refs 6-11), meaning that about ~45 per cent are `missing'. Here we report a determination of the mass-density of a previously undetected population of baryons, in the warm-hot phase of the intergalactic medium. We show that this mass density is consistent, within the uncertainties, with the mass density of the missing baryons.

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