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The x-ray luminosity-redshift relationship of quasars
1Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.
Chronometric cosmology accurately describes quasar X-ray luminosity and redshift. This relationship holds even after accounting for observational biases, supporting cosmological models.
Area of Science:
- Cosmology
- Astrophysics
- Astronomy
Background:
- The X-ray luminosity-redshift relationship is a key tool for cosmological studies.
- Previous observations have suggested potential biases in this relationship.
Purpose of the Study:
- To test the validity of chronometric cosmology using quasar X-ray data.
- To investigate the correlation between absolute X-ray luminosity and redshift.
Main Methods:
- Analysis of X-ray data from 49 quasars observed by the Einstein satellite.
- Application of Friedmann cosmology principles.
- Nonparametric, maximum-likelihood bias removal techniques.
Main Results:
- Chronometric cosmology provides an excellent fit for the observed X-ray luminosity-redshift relationship.
- A significant correlation (>0.8) between absolute X-ray luminosity and redshift was found.
- This correlation remained robust after bias correction.
Conclusions:
- The findings support chronometric cosmology as a viable model.
- The observed luminosity-redshift trend is intrinsic and not solely due to observational magnitude bias.
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