An original constraint on the Hubble constant: h>74

Abstract : The Hubble parameter H0 is still not very well measured. Although the Hubble Key Project, Chandra and WMAP gave good estimates, the uncertainties remain quite large. In this brief report, we suggest an original and independent method to derive a lower limit on H0 using the absorption of very high energy gamma-rays by the cosmic infrared background. With conservative hypothesis, we obtain H0>74 km/s/Mpc at the 68% confidence level, which favors the upper end of the intervals allowed by dedicated experiments.
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Journal articles
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2008, 389, pp.919-924. <10.1111/j.1365-2966.2008.13607.x>


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Submitted on : Thursday, April 24, 2008 - 8:00:35 AM
Last modification on : Tuesday, October 28, 2014 - 6:00:17 PM

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A. Barrau, A. Gorecki, J. Grain. An original constraint on the Hubble constant: h>74. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2008, 389, pp.919-924. <10.1111/j.1365-2966.2008.13607.x>. <in2p3-00275468>

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