Results 11 to 20 of about 1,219,804 (296)
Single Parameter Model for Galaxy Rotation Curves
GalaxiesOne key piece of evidence for dark matter is the rotation-curve problem: the disagreement between measured galactic rotation curves and their luminous mass.
Sophia N. Cisneros +4 more
doaj +2 more sources
Testing universal dark-matter caustic rings with galactic rotation curves
Physics Letters B, 2023 Infall of cold dark matter on a galaxy may result in caustic rings where the particle density is enhanced. They may be searched for as features in the galactic rotation curves.
Daniil Davydov, Sergey Troitsky
doaj +2 more sources
On the Counter-Rotation of Closed Time-like Curves [PDF]
Universe, 2022 While it is tempting to think of closed time-like curves (CTCs) around rotating bodies, such as a black hole, as being “caused” by the rotation of the source, Andréka et al.
Yuanyuan Duan +3 more
doaj +3 more sources
Galaxy Rotation Curves in Covariant Hořava-Lifshitz Gravity
Galaxies, 2013 Using the multiplicity of solutions for the projectable case of the covariant extension of Hořava-Lifshitz gravity, we show that an appropriate choice for the auxiliary field allows for an effective description of galaxy rotation curves. This description
Jean Alexandre, Martyna Kostacinska
doaj +2 more sources
Testing Bose–Einstein condensate dark matter models with the SPARC galactic rotation curves data
European Physical Journal C: Particles and Fields, 2020 The nature of one of the fundamental components of the Universe, dark matter, is still unknown. One interesting possibility is that dark matter could exist in the form of a self-interacting Bose–Einstein Condensate (BEC).
Maria Crăciun, Tiberiu Harko
doaj +2 more sources
Uncertainties in galaxy rotation curves [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT Assessing the likelihood that the rotation curve of a galaxy matches predictions from galaxy formation simulations requires that the uncertainties in the circular speed as a function of radius derived from the observational data be statistically robust. Few uncertainties presented in the literature meet this requirement. In this
Sellwood, J A +2 more
openaire +2 more sources
On the Extraction of Optical Rotation Curves for Spiral Galaxies [PDF]
Journal of Astronomy and Space Sciences, 1998 We discussed four different methods - the single, double and triple Gaussian fits, and the intensity weighted centroid fit - which extract rotation curves from several emission lines ([OII], Hβ, [OIII], and Hα) of spiral galaxies. Spatial extents and the
Young-Jong Sohn +2 more
doaj +1 more source
Characterization of Spherical and Plane Curves Using Rotation Minimizing Frames [PDF]
, 2022 In this work, we study plane and spherical curves in Euclidean and Lorentz-Minkowski 3-spaces by employing rotation minimizing (RM) frames. By conveniently writing the curvature and torsion for a curve on a sphere, we show how to find the angle between ...
da Silva, Luiz C. B.; id_orcid +2 more
core +1 more source
HI Rotation Curves of Galaxies [PDF]
Symposium - International Astronomical Union, 1987 The observational evidence on the discrepancy between the mass distribution in galaxies derived from HI rotation curves and that derived from the distribution of light is reviewed. In the outer parts the discrepancy is such that in some galaxies there is at least three times as much dark matter as luminous matter.
SANCISI, R, VANALBADA, TS
openaire +2 more sources
Dark Baryons and Rotation Curves [PDF]
The Astrophysical Journal, 1997 The best measured rotation curve for any galaxy is that of the dwarf spiralXXXX DDO 154, which extends out to about 20 disk scale lengths. It provides an ideal laboratory for testing the universal density profile prediction from high resolution numerical simulations of hierarchical clustering in cold dark matter dominated cosmological models.
Burkert, A., Silk, J.
openaire +2 more sources