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125 papers
Effects of heterogeneous data sets and time-lag measurement techniques on cosmological parameter constraints from MgII and CIV reverberation-mapped quasar data
Shulei Cao, Michal Zajaček, Bożena Czerny +2
Previously, we demonstrated that MgII and CIV reverberation-mapped quasars (RM QSOs) are standardizable and that the cosmological parameters inferred using the broad-line region ra…
Median Statistics Estimate of the Distance to M87
Nicholas Rackers, Sofia Splawska, Bharat Ratra
de Grijs and Bono compiled 211 independent measurements of the distance to galaxy M87 in the Virgo cluster from 15 different tracers and reported the arithmetic mean of a subset of…
Effect of extinction on quasar luminosity distances determined from UV and X-ray flux measurements
Michal Zajaček, Bożena Czerny, Narayan Khadka +4
In Khadka et al. (2023), a sample of X-ray-detected reverberation-mapped quasars was presented and applied for the comparison of cosmological constraints inferred using two well-es…
, , and other constraints from lower-redshift, non-CMB, expansion-rate data
Shulei Cao, Bharat Ratra
We use updated Type Ia Pantheon+ supernova, baryon acoustic oscillation, and Hubble parameter (now also accounting for correlations) data, as well as new reverberation-measured C I…
Tilted non-spatially-flat inflation
Bharat Ratra
We construct non-linear inflaton potential energy densities that describe not-necessarily very-slowly-rolling closed and open inflation models, and compute tilted primordial spatia…
Quasar UV/X-ray relation luminosity distances are shorter than reverberation-measured radius-luminosity relation luminosity distances
Narayan Khadka, Michal Zajaček, Raj Prince +5
We use measurements of 59/58 quasars (QSOs), over a redshift range , to do a comparative study of the radius--luminosity () and X-rayUV luminosity…