2026-06-28T20:33:38Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/883772023-10-26T02:20:52Zcom_20.500.14352_14col_20.500.14352_15
A new measurement of the Hubble constant and matter content of the universe using extragalactic background light γ-ray attenuation
Domínguez Díaz, Alberto
Wojtak, R.
Finke, J.
Ajello, M.
Helgason, K.
Prada, F.
Desai, A.
Paliya, V.
Marcotulli, L.
Hartmann, D. H.
The Hubble constant H 0 and matter density Ω m 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 H_(0)=67.4^(+6.0)_(-6.2) km s− 1 Mpc− 1 and Ω_(m) = 0.14^(+0.06)_(-0.07). 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 Ω_(m)= 0.29 ± 0.02.
2023-10-24T07:55:35Z
2023-10-24T07:55:35Z
2023-10-24T07:55:35Z
2019-11-10
journal article
https://hdl.handle.net/20.500.14352/88377
0004-637X
10.3847/1538-4357/ab4a0e
1538-4357
eng
S-15633Y
80NSSC18K1720
AST-1715256
16599
Domínguez, A., Wojtak, R., Finke, J., Ajello, M., Helgason, K., Prada, F., ... & Hartmann, D. H. (2019). A new measurement of the Hubble constant and matter content of the Universe using extragalactic background light γ-ray attenuation. The Astrophysical Journal, 885(2), 137.
open access
IOP Publishing