Galaxy cluster hydrostatic bias in Kottler spacetime

Desai, Shantanu (2022) Galaxy cluster hydrostatic bias in Kottler spacetime. Physics of the Dark Universe, 35. pp. 1-3. ISSN 2212-6864

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We calculate the relativistic corrections to hydrostatic X-ray masses for galaxy clusters in Kottler spacetime, which is the spherically symmetric solution to Einstein's equations in General relativity endowed with a cosmological constant. The hydrostatic masses for clusters (calculated assuming Newtonian gravity) have been found to be underestimated compared to lensing masses, and this discrepancy is known as hydrostatic mass bias. Since the relativistic hydrostatic X-ray masses are automatically lower than lensing masses, under the edifice of Kottler metric, we check if the hydrostatic mass bias problem gets alleviated using this ansatz. We consider a sample of 18 galaxy clusters for this pilot test. We find that the ratio of X-ray to lensing mass is close to unity even in Kottler spacetime. Therefore, the effect of relativistic corrections to hydrostatic X-ray masses for galaxy clusters is negligible. © 2021 Elsevier B.V.

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IITH Creators:
IITH CreatorsORCiD
Desai, Shantanu
Item Type: Article
Uncontrolled Keywords: hydrostatic X-ray , Kottler spacetime, relativistic hydrostatic X-ray masses.
Subjects: Physics
Physics > Astronomy Astrophysics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 18 Jul 2022 12:14
Last Modified: 18 Jul 2022 12:14
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