The DOI matches its Crossref record; 42 of the 42 references it cites were found in a registry or an index.
Cosmological constraints from the Hubble diagram of quasars at high redshifts
Open accessAbstract
The concordance model (Λ cold dark matter (ΛCDM) model, where Λ is the cosmological constant) reproduces the main current cosmological observations1–4 assuming the validity of general relativity at all scales and epochs and the presence of CDM and of Λ, equivalent to dark energy with a constant density in space and time. However, the ΛCDM model is poorly tested in the redshift interval between the farthest observed type Ia supernovae5 and the cosmic microwave background. We present measurements of the expansion rate of the Universe based on a Hubble diagram of quasars. Quasars are the most luminous persistent sources in the Universe, observed up to redshifts of z ≈ 7.5 (refs. 6,7). We estimate their distances following a method developed by our group8–10, based on the X-ray and ultraviolet emission of the quasars. The distance modulus/redshift relation of quasars at z < 1.4 is in agreement with that of supernovae and with the concordance model. However, a deviation from the ΛCDM model emerges at higher redshift, with a statistical significance of ~4σ. If an evolution of the dark energy equation of state is allowed, the data suggest dark energy density increasing with time. The concordance cosmology model is poorly tested at high redshifts. Here the expansion rate of the Universe in the range 0.5 < z < 5.1 is measured based on a Hubble diagram of quasars, whose distances are estimated from their X-ray and ultraviolet emission.
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A 2.4% DETERMINATION OF THE LOCAL VALUE OF THE HUBBLE CONSTANT*
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Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
Betoule, M., Kessler, R., Guy, J., Mosher, J., Hardin, D., Biswas, R., Astier, P., El-Hage, P., Konig, M., Kuhlmann, S., et al. (2014) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201423413 · Cited by 1,905
Composite Quasar Spectra from the Sloan Digital Sky Survey
Vanden Berk, D. E., Richards, G. T., Bauer, A., Strauss, M. A., Schneider, D. P., Heckman, T. M., York, D. G., Hall, P. B., Fan, X., Knapp, G. R., et al. (2001) · The Astronomical Journal · doi:10.1086/321167 · Cited by 1,887
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A luminous quasar at a redshift of z = 7.085
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Cited by
Di Valentino, E., Said, J. L., Riess, A., Pollo, A., Poulin, V., Gómez-Valent, A., Weltman, A., Palmese, A., Huang, C. D., Bruck, C. V. D., et al. (2025) · Physics of the Dark Universe · doi:10.1016/j.dark.2025.101965 · Cited by 319
Self-citationA buyer’s guide to the Hubble constant
Shah, P., Lemos, P., & Lahav, O. (2021) · The Astronomy and Astrophysics Review · doi:10.1007/s00159-021-00137-4 · Cited by 196
Investigating Cosmic Discordance
Di Valentino, E., Melchiorri, A., & Silk, J. (2021) · The Astrophysical Journal Letters · doi:10.3847/2041-8213/abe1c4 · Cited by 166
Cosmic dissonance: Are new physics or systematics behind a short sound horizon?
Arendse, N., Wojtak, R. J., Agnello, A., Chen, G. C.-F., Fassnacht, C. D., Sluse, D., Hilbert, S., Millon, M., Bonvin, V., Wong, K. C., et al. (2020) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201936720 · Cited by 93
Abdalla, E., Abellán, G. F., Aboubrahim, A., Agnello, A., Akarsu, Ö., Akrami, Y., Alestas, G., Aloni, D., Amendola, L., Anchordoqui, L. A., et al. (2022) · Journal of High Energy Astrophysics · doi:10.1016/j.jheap.2022.04.002 · Cited by 37
Metadata
- Authors
- Risaliti, G., & Lusso, E.
- Venue
- Nature Astronomy
- Published
- 2019-01-28
- Volume
- 3
- Issue
- 3
- Pages
- 272-277
- ISSN
- 2397-3366 (ISSN-L)
- OpenAlex
- W2900153593
- Cited by
- 371
- References
- 42
- FWCI
- 28.99
- Type
- journal article
- Language
- en
- Open access
- green
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