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Verfasst von:Angrick, Christian [VerfasserIn]   i
 Bartelmann, Matthias [VerfasserIn]   i
Titel:Statistics of gravitational potential perturbations
Titelzusatz:a novel approach to deriving the x-ray temperature function
Verf.angabe:C. Angrick and M. Bartelmann
Fussnoten:Gesehen am 26.09.2017
Titel Quelle:Enthalten in: De.arxiv.org
Jahr Quelle:2014
Band/Heft Quelle:(2014) Artikel-Nummer 0802.1680, 10 Seiten
Abstract:Context. While the halo mass function is theoretically a very sensitive measure of cosmological models, masses of dark-matter halos are poorly defined, global, and unobservable quantities. Aims. We argue that local, observable quantities such as the X-ray temperatures of galaxy clusters can be directly compared to theoretical predictions without invoking masses. We derive the X-ray temperature function directly from the statistics of Gaussian random fluctuations in the gravitational potential. Methods. We derive the abundance of potential minima constrained by the requirement that they belong to linearly collapsed structures. We then use the spherical-collapse model to relate linear to non-linear perturbations, and the virial theorem to convert potential depths to temperatures. No reference is made to mass or other global quantities in the derivation. Results. Applying a proper high-pass filter that removes large enough modes from the gravitational potential, we derive an X-ray temperature function that agrees very well with the classical Press-Schechter approach on relevant temperature scales, but avoids the necessity of measuring masses. Conclusions. TThis first study shows that and how an X-ray temperature function of galaxy clusters can be analytically derived, avoiding the introduction of poorly defined global quantities such as halo masses. This approach will be useful for reducing scatter in observed cluster distributions and thus in cosmological conclusions drawn from them.
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Kostenfrei: Verlag: http://arxiv.org/abs/0802.1680
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1563806606
Verknüpfungen:→ Sammelwerk

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