An original constraint on the Hubble constant: h > 0.74
Abstract
The Hubble parameter H0 is still not very well measured. Although the Hubble Key Project, Chandra and the Wilkinson Microwave Anisotropy Probe 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 γ-rays by the cosmic infrared background. With conservative hypotheses, we obtain H0 > 74 kms-1Mpc-1 at the 68 per cent confidence level, which favours the upper end of the intervals allowed by dedicated experiments.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 2008
- DOI:
- 10.1111/j.1365-2966.2008.13607.x
- arXiv:
- arXiv:0804.3699
- Bibcode:
- 2008MNRAS.389..919B
- Keywords:
-
- cosmological parameters;
- diffuse radiation;
- Astrophysics;
- High Energy Physics - Phenomenology
- E-Print:
- 7 pages, 3 figures. Version accepted by MNRAS, minor changes, results unchanged