Cosmological constraints from H ii starburst galaxy apparent magnitude and other cosmological measurements

Abstract

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, baryon acoustic oscillations peak length scale, and Hubble parameter measurements result in relatively model-independent and restrictive estimates of the current values of the non-relativistic matter density parameter $\Omega _{\rm m_0}$ and the Hubble constant H0. These estimates favor a 2.0σ to 3.4σ (depending on cosmological model) lower H0 than what is measured from the local expansion rate. The combined data are consistent with dark energy being a cosmological constant and with flat spatial hypersurfaces, but do not strongly rule out mild dark energy dynamics or slightly non-flat spatial geometries.

Cosmological Constraints on the Coupling Model from Observational Hubble Parameter and Baryon Acoustic Oscillation Measurements

“…The 40 OHD we used here are based on cosmic chronometers (see [34][35][36][37][38] for the usage of these 31 H(z) data) and radial BAO size methods, as shown in Table 1, where we could use them together is because they are statistically-independent (systematic uncertainty of individual data point is accounted for, and in fact, based on the reduced χ 2 value listed in Table 2, the errors are overestimated). Systematic errors that affect H(z) measurements from cosmic chronometers were studied [39,40], and were recently re-examined in [41,42].…”

“…in which H th (z i |p), H obs (z i ), and σ(z i ) are the theoretical Hubble parameter at redshift z i , the OHD (or H(z) data), and the uncertainty of each H obs (z i ), respectively. For BAO, we use the same procedure given in Cao et al [36]. We show in Tables 2 and 3 the unmarginalized and marginalized best-fitting results (the marigninalized ones are the posterior means) with 1σ confidence regions, and with the best-fitting parameters (details described below), we can substitute Equation (15) into Equation 5to obtain the age of the universe.…”

Using quasar X-ray and UV flux measurements to constrain cosmological model parameters

“…In this paper we also use 11 BAO measurements spanning the redshift range 0.0106 ≤ ≤ 2.33 and 31 ( ) measurements spanning the redshift range 0 ≤ ≤ 1.965. The BAO measurements are given in Table 1 of this paper and include the first 9 of Table 1 of Cao et al (2020a) and the two new measurements of du Mas des Bourboux et al (2020) (see the following section for BAO covariance matrices), and the 31 ( ) measurements are given in Table 2 of Ryan et al (2018). The QSO− < 1.479 (and less so the QSO− < 1.75) data have almost cosmological-model-independent − relation parameters and so seem to be potentially safely standardizable, and the QSO− < 1.479 data constraints are quite consistent with those from the BAO + ( ) data, so we also use the QSO− < 1.479(/1.75) data in combination with BAO + ( ) data to constrain cosmological and − relation parameters.…”

A hybrid model of viscous and Chaplygin gas to tackle the Universe acceleration

“…containing a population of O and/or B stars) may be used as a cosmological tracer to constrain cosmological model parameters. A compilation of 153 HII galaxies (HIIG), containing apparent magnitude, emission line luminosity and velocity dispersion is provided by [64,68]. Then, the chi square function is estimated by…”

“…Data Availability Statement This manuscript has no associated data or the data will not be deposited. [Authors' comment: The data used in this manuscript are available in the References [4,[57][58][59]64,68].] Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.…”