Ω_0 from the Apparent Evolution of Gas Fractions in Rich Clusters of Galaxies
| dc.creator | Danos, Rebecca | |
| dc.creator | Pen, Ue-Li | |
| dc.date | 1998-03-06 | |
| dc.date.accessioned | 2026-07-07T02:26:17Z | |
| dc.date.available | 2026-07-07T02:26:17Z | |
| dc.description | We apply a unique gas fraction estimator to published X-ray cluster properties and we compare the derived gas fractions of observed clusters to simulated ones. The observations are consistent with a universal gas fraction of 0.15+/-0.01h_{50}^{-3/2} for the low redshift clusters that meet our selection criteria. The fair sampling hypothesis states that all clusters should have a universal constant gas fraction for all times. Consequently, any apparent evolution would most likely be explained by an incorrect assumption for the angular-diameter distance relation. We show that the high redshift cluster data is consistent with this hypothesis for Ω_0<0.63 (95% formal confidence, flat $Λ$ model) or Ω_0<0.60 (95% formal confidence, hyperbolic open model). The maximum likelihood occurs at Ω_0=0.2 for a spatially flat cosmological constant model. | |
| dc.description | 12 pages incl. 4 figures | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9803058 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9803058 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/12213 | |
| dc.subject | Astrophysics | |
| dc.title | Ω_0 from the Apparent Evolution of Gas Fractions in Rich Clusters of Galaxies | |
| dc.type | text |