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Determining the range of validity of quasar X-ray and UV flux measurements for constraining cosmological model parameters
Narayan Khadka, Bharat Ratra
We use six different cosmological models to study the recently-released compilation of X-ray and UV flux measurements of 2038 quasars (QSOs) which span the redshift range $0.009 \l…
Cosmological constraints from higher-redshift gamma-ray burst, HII starburst galaxy, and quasar (and other) data
Shulei Cao, Joseph Ryan, Narayan Khadka +1
We use higher-redshift gamma-ray burst (GRB), HII starburst galaxy (HIIG), and quasar angular size (QSO-AS) measurements to constrain six spatially flat and non-flat cosmological m…
Constraints on cosmological parameters from gamma-ray burst peak photon energy and bolometric fluence measurements and other data
Narayan Khadka, Bharat Ratra
We use measurements of the peak photon energy and bolometric fluence of 119 gamma-ray bursts (GRBs) extending over the redshift range of to simultaneously…
Cosmological constraints from HII starburst galaxy apparent magnitude and other cosmological measurements
Shulei Cao, Joseph Ryan, Bharat Ratra
We use HII starburst galaxy apparent magnitude measurements to constrain cosmological parameters in six cosmological models. A joint analysis of HII galaxy, quasar angular size, ba…
Using quasar X-ray and UV flux measurements to constrain cosmological model parameters
Narayan Khadka, Bharat Ratra
Risaliti and Lusso have compiled X-ray and UV flux measurements of 1598 quasars (QSOs) in the redshift range , part of which, , is large…