It has been known for over three decades that the monochromatic X-ray and UV luminosities in quasars are correlated, though non-linearly. This offers the possibility of using high-z quasars as standard candles for cosmological testing. In this paper, we use a recently assembled, high-quality catalogue of 1598 quasars extending all the way to redshift similar to 6, to compare the predictions of the R-h = ct and Lambda cold dark matter (Lambda CDM) cosmologies. In so doing, we affirm that the parameters characterizing the correlation depend only weakly on the chosen cosmology, and that both models account very well for the data. Unlike Lambda CDM, however, the R-h = ct model has no free parameters for this work, so the Bayesian Information Cr...
The cosmography method is a model-independent technique used to reconstruct the Hubble expansion of ...
Cosmography is used in cosmological data processing in order to constrain the kinematics of the univ...
The non-linear relation between the X-ray and ultraviolet (UV) luminosity in quasars has been used t...
We continue to build support for the proposal to use H II galaxies (HIIGx) and giant extragalactic H...
A Hubble diagram (HD) has recently been constructed in the redshift range $0\lesssim z\lesssim 6.5$ ...
The extensive catalogue of gamma-ray selected flat-spectrum radio quasars (FSRQs) produced by Fermi ...
We use three different data sets, specifically H(z) measurements from cosmic chronometers, the HII-g...
We present a new catalogue of ∼2400 optically selected quasars with spectroscopic redshifts and X-ra...
In the current framework, the standard parametrization of our Universe is the so-called Lambda cold ...
We apply several statistical estimators to high-resolution N-body simulations of two currently viabl...
So far large and different data sets revealed the accelerated expansion rate of the Universe, which ...
A previous analysis of starburst-dominated HII galaxies and HII regions has demonstrated a statistic...
The recently constructed Hubble diagram using a combined sample of SNLS and SDSS-II Type Ia SNe, and...
International audienceThe rotational velocity of distant galaxies, when interpreted as a size (lumin...
We examine whether a comparison between wCDM and $R_{\textrm{h}}=ct$ using merged Type-Ia SN catalo...
The cosmography method is a model-independent technique used to reconstruct the Hubble expansion of ...
Cosmography is used in cosmological data processing in order to constrain the kinematics of the univ...
The non-linear relation between the X-ray and ultraviolet (UV) luminosity in quasars has been used t...
We continue to build support for the proposal to use H II galaxies (HIIGx) and giant extragalactic H...
A Hubble diagram (HD) has recently been constructed in the redshift range $0\lesssim z\lesssim 6.5$ ...
The extensive catalogue of gamma-ray selected flat-spectrum radio quasars (FSRQs) produced by Fermi ...
We use three different data sets, specifically H(z) measurements from cosmic chronometers, the HII-g...
We present a new catalogue of ∼2400 optically selected quasars with spectroscopic redshifts and X-ra...
In the current framework, the standard parametrization of our Universe is the so-called Lambda cold ...
We apply several statistical estimators to high-resolution N-body simulations of two currently viabl...
So far large and different data sets revealed the accelerated expansion rate of the Universe, which ...
A previous analysis of starburst-dominated HII galaxies and HII regions has demonstrated a statistic...
The recently constructed Hubble diagram using a combined sample of SNLS and SDSS-II Type Ia SNe, and...
International audienceThe rotational velocity of distant galaxies, when interpreted as a size (lumin...
We examine whether a comparison between wCDM and $R_{\textrm{h}}=ct$ using merged Type-Ia SN catalo...
The cosmography method is a model-independent technique used to reconstruct the Hubble expansion of ...
Cosmography is used in cosmological data processing in order to constrain the kinematics of the univ...
The non-linear relation between the X-ray and ultraviolet (UV) luminosity in quasars has been used t...