Cosmological constraints from the Hubble diagram of quasars at high redshifts - INSPIRE

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Cosmological constraints from the Hubble diagram of quasars at high redshifts

Guido Risaliti
(
- Florence U.
)
,
Elisabeta Lusso
(
- Durham U.
)

Nov 6, 2018

6 pages

Published in:

Nature Astron. 3 (2019) 3, 272-277

Published: Jan 28, 2019

e-Print:

1811.02590 [astro-ph.CO]

DOI:

10.1038/s41550-018-0657-z

View in:

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Abstract: (Springer)

The concordance model (Λ cold dark matter (ΛCDM) model, where Λ is the cosmological constant) reproduces the main current cosmological observations 1

^{–}

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 supernovae 5 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 group 8

^{–}

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.

Note:

To appear in Nature Astronomy. This is the re-submitted version in the authors' custom format. The complete data table is available upon request

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