A new measurement of the Hubble constant and matter content of the universe using extragalactic background light γ-ray attenuation
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-photo...
| Autores: | , , , , , , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versión aceptada para publicación |
| Data de publicação: | 2019 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositório: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/197020 |
| Acesso em linha: | http://hdl.handle.net/10261/197020 |
| Access Level: | Acceso aberto |
| Palavra-chave: | BL Lacertae objects: general Cosmic background radiation Cosmology: observations Diffuse radiation ddc:520 |
| Resumo: | 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. © 2019 The American Astronomical Society. All rights reserved. |
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