The Scavenger Hunt for Quasar Samples to Be Used as Cosmological Tools
| Autor: | Dainotti, Maria Giovanna, Bargiacchi, Giada, Lenart, Aleksander Łukasz, Capozziello, Salvatore |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | Although the $\Lambda$ Cold Dark Matter model is the most accredited cosmological model, information at high redshifts ($z$) between type Ia supernovae ($z=2.26$) and the Cosmic Microwave Background ($z=1100$) is crucial to validate this model further. To this end, we have discovered a sample of 1132 quasars up to $z=7.54$ exhibiting a reduced intrinsic dispersion of the relation between ultraviolet and X-ray fluxes, $\delta_\mathrm{F}=0.22$ vs. $\delta_\mathrm{F}=0.29$ ($24\%$ less), than the original sample. This gold sample, once we correct the luminosities for selection biases and redshift evolution, enables us to determine the matter density parameter $\Omega_M$ with a precision of 0.09. Unprecedentedly, this quasar sample is the only one that, as a standalone cosmological probe, yields such tight constraints on $\Omega_M$ while being drawn from the same parent population of the initial sample. Comment: 36 pages, 19 figures,2 table. Comments are welcome. Accepted in Galaxies |
| Databáze: | arXiv |
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