J 2024

Effects of heterogeneous data sets and time-lag measurement techniques on cosmological parameter constraints from Mg II and C IV reverberation-mapped quasar data

CAO, Shulei, Michal ZAJAČEK, Bożena CZERNY, Swayamtrupta PANDA, Bharat RATRA et. al.

Basic information

Original name

Effects of heterogeneous data sets and time-lag measurement techniques on cosmological parameter constraints from Mg II and C IV reverberation-mapped quasar data

Authors

CAO, Shulei, Michal ZAJAČEK (703 Slovakia, guarantor, belonging to the institution), Bożena CZERNY, Swayamtrupta PANDA and Bharat RATRA

Edition

Monthly Notices of the Royal Astronomical Society, Oxford University Press, 2024, 0035-8711

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 4.800 in 2022

Organization unit

Faculty of Science

UT WoS

001169271500018

Keywords in English

cosmological parameters; cosmology: observations; dark energy; quasars: emission lines

Tags

Tags

International impact, Reviewed
Změněno: 25/4/2024 11:05, Mgr. Marie Šípková, DiS.

Abstract

V originále

Previously, we demonstrated that Mg II and C IV reverberation-mapped quasars (RM QSOs) are standardizable and that the cosmological parameters inferred using the broad-line region radius-luminosity (R-L) relation are consistent with those determined from better-established cosmological probes. With more data expected from ongoing and future spectroscopic and photometric surveys, it is imperative to examine how new QSO data sets of varied quality, with their own specific luminosity and time-delay distributions, can be best used to determine more restrictive cosmological parameter constraints. In this study, we test the effect of adding 25 OzDES Mg II RM QSOs as well as 25 lower quality SDSS RM C IV QSOs, which increases the previous sample of RM QSOs by ∼36 per cent. Although cosmological parameter constraints become tighter for some cosmological models after adding these new QSOs, the new combined data sets have increased differences between R-L parameter values obtained in different cosmological models and thus a lower standardizability for the larger Mg II + C IV compilation. Different time-delay methodologies, particularly the ICCF and CREAM methods used for inferring time delays of SDSS RM QSOs, slightly affect cosmological and R-L relation parameter values, however, the effect is negligible for (smaller) compilations of robust time-delay detections. Our analysis indicates that increasing the sample size is not sufficient for tightening cosmological constraints and a quality cut is necessary to obtain a standardizable RM QSO sample.

Links

GM24-10599M, research and development project
Name: Hvězdy v galaktických jádrech: vzájemný vztah s masivními černými dírami
Investor: Czech Science Foundation, Stars in galactic nuclei: interrelation with massive black holes