A New Measurement of the Hubble Constant and Matter Content of the Universe Using Extragalactic Background Light γ-Ray Attenuation

TY - JOUR

T1 - A New Measurement of the Hubble Constant and Matter Content of the Universe Using Extragalactic Background Light γ-Ray Attenuation

AU - Dominguez, A.

AU - Wojtak, R.

AU - Finke, J.

AU - Ajello, M.

AU - Helgason, K.

AU - Prada, F.

AU - Desai, A.

AU - Paliya, V

AU - Marcotulli, L.

AU - Hartmann, D. H.

PY - 2019/11/10

Y1 - 2019/11/10

N2 - The Hubble constant H 0 and matter density Ωm of the universe are measured using the latest γ-ray attenuation results from Fermi-LAT and Cerenkov telescopes. This methodology is based upon the fact that the extragalactic background light supplies opacity for very high energy photons via photon-photon interaction. The amount of γ-ray 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 H0 = 67.4-6.2 +6.0 km s-1 Mpc-1 and Ωm = 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 γ-rays 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 Ωm = 0.29 ± 0.02.

AB - The Hubble constant H 0 and matter density Ωm of the universe are measured using the latest γ-ray attenuation results from Fermi-LAT and Cerenkov telescopes. This methodology is based upon the fact that the extragalactic background light supplies opacity for very high energy photons via photon-photon interaction. The amount of γ-ray 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 H0 = 67.4-6.2 +6.0 km s-1 Mpc-1 and Ωm = 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 γ-rays 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 Ωm = 0.29 ± 0.02.

KW - BL Lacertae objects: general

KW - cosmic background radiation

KW - cosmology: observations

KW - diffuse radiation

U2 - 10.3847/1538-4357/ab4a0e

DO - 10.3847/1538-4357/ab4a0e

M3 - Journal article

SN - 0004-637X

VL - 885

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 137

ER -