A New Measurement of the Hubble Constant and Matter Content of the Universe Using Extragalactic Background Light γRay Attenuation
Abstract
The Hubble constant H _{0} and matter density Ω_{ m } of the universe are measured using the latest γray attenuation results from FermiLAT and Cerenkov telescopes. This methodology is based upon the fact that the extragalactic background light supplies opacity for very high energy photons via photonphoton interaction. The amount of γray attenuation along the line of sight depends on the expansion rate and matter content of the universe. This novel strategy results in a value of {H}_{0}={67.4}_{6.2}^{+6.0} km s^{1} Mpc^{1} and {{{Ω }}}_{m}={0.14}_{0.07}^{+0.06}. These estimates are independent and complementary to those based on the distance ladder, cosmic microwave background (CMB), clustering with weak lensing, and strong lensing data. We also produce a joint likelihood analysis of our results from γrays and those from more mature methodologies, excluding the CMB, yielding a combined value of H _{0} = 66.6 ± 1.6 km s^{1} Mpc^{1} and Ω_{ m } = 0.29 ± 0.02.
 Publication:

The Astrophysical Journal
 Pub Date:
 November 2019
 DOI:
 10.3847/15384357/ab4a0e
 arXiv:
 arXiv:1903.12097
 Bibcode:
 2019ApJ...885..137D
 Keywords:

 BL Lacertae objects: general;
 cosmic background radiation;
 cosmology: observations;
 diffuse radiation;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 9 pages, 6 figures, 1 table. Accepted by ApJ