Measurement of the expansion rate of the Universe from γ-ray attenuation

Abstract

A measurement of the expansion rate of the Universe (that is the Hubble constant, H0) is derived here using the gamma-ray attenuation observed in the spectra of gamma-ray sources produced by the interaction of extragalactic gamma-ray photons with the photons of the extragalactic background light (EBL). The Hubble constant that is determined with our technique, for a Lambda CDM cosmology, is H0=71.8_{-5.6}^{+4.6}(stat)_{-13.8}^{+7.2}(syst) km s^{-1} Mpc^{-1}. This value is compatible with present-day measurements using well established methods such as local distance ladders and cosmological probes. The recent detection of the cosmic gamma-ray horizon (CGRH) from multiwavelength observation of blazars, together with the advances in the knowledge of the EBL, allow us to measure the expansion rate of the Universe. This estimate of the Hubble constant shows that gamma-ray astronomy has reached a mature enough state to provide cosmological measurements, which may become more competitive in the future with the construction of the Cherenkov Telescope Array. We find that the maximum dependence of the CGRH on the Hubble constant is approximately between redshifts 0.04 and 0.1, thus this is a smoking gun for planning future observational efforts. Other cosmological parameters, such as the total dark matter density Omega_m and the dark energy equation of state w, are explored as well.

6 pages, 3 figures; accepted by ApJ Letters on June 10, 2013

References in corpus (7)

• The All-wavelength Extended Groth Strip International Survey (AEGIS) Data Sets
• The Imprint of The Extragalactic Background Light in the Gamma-Ray Spectra of Blazars
• Detection of the cosmic γ-ray horizon from multiwavelength observations of blazars
• The Resolved Near-Infrared Extragalactic Background
• The Resolved NIR Extragalactic Background
• The Hubble constant and new discoveries in cosmology
• An original constraint on the Hubble constant: h>0.74

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