Standardizing reverberation-measured C iv time-lag quasars, and using them with standardized Mg ii quasars to constrain cosmological parameters

Author:

Cao Shulei1ORCID,Zajaček Michal2ORCID,Panda Swayamtrupta34ORCID,Martínez-Aldama Mary Loli5ORCID,Czerny Bożena3ORCID,Ratra Bharat1ORCID

Affiliation:

1. Department of Physics, Kansas State University , 116 Cardwell Hall, Manhattan, KS 66506, USA

2. Department of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University , Kotlářská 2, CZ-611 37 Brno, Czech Republic

3. Center for Theoretical Physics, Polish Academy of Sciences , Al. Lotników 32/46, PL-02-668 Warsaw, Poland

4. Laboratório Nacional de Astrofísica - MCTIC , R. dos Estados Unidos, 154 - Nações, Itajubá, MG 37504-364, Brazil

5. Departamento de Astronomía, Universidad de Chile , Camino del Observatorio 1515, Santiago, Casilla 36-D, Chile

Abstract

ABSTRACT We use 38 C iv quasar (QSO) reverberation-mapped observations, which span eight orders of magnitude in luminosity and the redshift range 0.001064 ≤ z ≤ 3.368, to simultaneously constrain cosmological-model and QSO radius–luminosity (R–L) relation parameters in six cosmological models, using an improved technique that more correctly accounts for the asymmetric errors bars of the time-lag measurements. We find that R–L relation parameters are independent of the cosmological models used in the analysis and so the R–L relation can be used to standardize the C iv QSOs. The C iv QSO cosmological constraints are consistent with those from Mg ii QSOs, allowing us to derive joint C iv + Mg ii QSO cosmological constraints which are consistent with currently accelerated cosmological expansion, as well as consistent with cosmological constraints derived using better-established baryon acoustic oscillation (BAO) and Hubble parameter [H(z)] measurements. When jointly analysed with H(z) + BAO data, current C iv + Mg ii QSO data mildly tighten current H(z) + BAO data cosmological constraints.

Funder

DOE

National Science Centre

GACR

NCN

Conselho Nacional de Desenvolvimento Científico e Tecnológico

MŠMT

Kansas State University

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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