Detailed Information on Publication Record
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
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 |
|