Rotation curves of spiral galaxies: a general-relativistic model
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Publication:1888734
zbMATH Open1061.83006arXivastro-ph/0405572MaRDI QIDQ1888734
Publication date: 26 November 2004
Published in: Gravitation \& Cosmology (Search for Journal in Brave)
Abstract: Spiral galaxies are considered as static, spherically symmetric Dark Matter Configurations (DMC)in which non-zero rest-mass particles (NZRPs) move along appropriate trajectories. Using general relativity (GR), we show that a mass of dark matter about 127 - 212 is required inside the sphere of size kpc for agreement with the observed typical orbital velocity ranging from 150 to 250 km sec. In our model, it is possible to obtain flat, slightly rising, and even declining rotation curves. The model self-evidently explains the reason why most of the spirals show almost flat or slightly rising rotation curves and very few show declining curves. The NZRPs follow trajectories, and are finally trapped in circles of minimum radii with rotation velocities reaching km sec . The velocity values are consistent with observations of central regions of various galaxies. This scenario may also lead to conditions suitable for evolution of relativistic supermassive stars and supermassive black holes at the centres of various galaxies. Based on this study, we obtain the density parameter , leading to an open model of the Universe with an age of Gyr, which is significantly higher than the presently estimated age of globular clusters Gyr.
Full work available at URL: https://arxiv.org/abs/astro-ph/0405572
Relativistic cosmology (83F05) Observational and experimental questions in relativity and gravitational theory (83B05) Galactic and stellar dynamics (85A05)
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