RT Journal Article
T1 A new measurement of the Hubble constant and matter content of the universe using extragalactic background light γ-ray attenuation
A1 Domínguez Díaz, Alberto
A1 Wojtak, R.
A1 Finke, J.
A1 Ajello, M.
A1 Helgason, K.
A1 Prada, F.
A1 Desai, A.
A1 Paliya, V.
A1 Marcotulli, L.
A1 Hartmann, D. H.
AB 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.
PB IOP Publishing
SN 0004-637X
YR 2019
FD 2019-11-10
LK https://hdl.handle.net/20.500.14352/88377
UL https://hdl.handle.net/20.500.14352/88377
LA eng
NO 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.
NO Ministerio de Economía y Competitividad (MINECO)
NO Villum Fonden
NO National Aeronautics and Space Administration (NASA)
NO National Science Foundation (NSF)
NO Icelandic Research Fund
DS Docta Complutense
RD 20 ene 2026