Dark energy constraints from quasar observations

Cosmology; Dark energy; Quasars; Absolute calibration; Active galactic nuclei; Cosmic microwave backgrounds; Energy constraint; Expansion of the universe; Hubble constant; Independent measurement; Measurements of; Physics and Astronomy (all); astro-ph.CO

Abstract :

[en] Recent measurements of the parameters of the concordance cosmology model (ΛCDM) done in the low-redshift Universe with supernovae Ia/Cepheids, and in the distant Universe done with cosmic microwave background imply different values for the Hubble constant (67.4 ± 0.5 km/(s Mpc) from Planck vs. 74.03 ± 1.42 km/(s Mpc) Riess et al. 2019). This Hubble constant tension implies that either the systematic errors are underestimated, or the ΛCDM does not represent well the observed expansion of the Universe. Since quasars - active galactic nuclei - can be observed in the nearby Universe up to redshift z ≈ 7.5, they are suitable to estimate the cosmological properties in a large redshift range. Our group develops two methods based on the observations of quasars in the late Universe up to redshift z ≈ 4.5, with the objective to determine the expansion rate of the Universe. These methods do not yet provide an independent measurement of the Hubble constant since they do not have firm absolute calibration but they allow to test the ΛCDM model, and so far no departures from this model were found.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Czerny, B.; Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland

Martínez-Aldama, M.L.; Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland

Wojtkowska, G.; Warsaw University Observatory, Warszawa, Poland

Zajaček, M.; Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland

Marziani, P.; INAF, Osservatorio Astronomico di Padova, Italy

Dultzin, D.; Instituto de Astronomía, UNAM, Mexico

Naddaf Moghaddam, Mohammad Hassan ; Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland

Panda, S.; Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland

Prince, R.; Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland

Przyluski, R.; Space Research Centre, Polish Academy of Sciences, Warsaw, Poland

Ralowski, M.; Astronomical Observatory of the Jagiellonian University, Krakow, Poland

Śniegowska, M.; Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland

Language :

English

Title :

Dark energy constraints from quasar observations

Publication date :

April 2021

Event name :

100 years of the Polish Physical Society Congress

Event date :

16-18 October 2020

Journal title :

Acta Physica Polonica A

ISSN :

0587-4246

eISSN :

1898-794X

Publisher :

Polska Akademia Nauk, Warsaw, Poland

Volume :

139

Issue :

Pages :

389-393

Peer reviewed :

Peer Reviewed verified by ORBi

Funding text :

The project is partially based on observations made with the SALT under programs 2012-2-POL-003, 2013-1-POL-RSA-002, 2013-2-POL-RSA-001, 2014-1-POL-RSA-001, 2014-2-SCI-004, 2015-1-SCI-006, 2015-2-SCI-017, 2016-1-SCI-011, 2016-2-SCI-024, 2017-1-SCI-009, 2017-2-SCI-033 and 2018-1-MLT-004 (PI: B. Czerny). The authors acknowledge the financial support by the National Science Centre, Poland, grant No. 2017/26/A/ST9/00756 (Maestro 9), and by the Ministry of Science and Higher Education (MNiSW) grant DIR/WK/2018/12. The Polish participation in SALT is funded by grant No. MNiSW DIR/WK/2016/07.

Commentary :

6 pages, 2 figures, contribution to the Proceedings of the 100 years of the Polish Physical Society Congress, 16-18 October 2020, Warsaw, Poland. http://info.ifpan.edu.pl/APP/

Available on ORBi :

since 15 January 2025

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