Results 61 to 70 of about 1,810 (211)
Newtonian Fractional-Dimension Gravity and Galaxies without Dark Matter
Universe, 2023 We apply Newtonian fractional-dimension gravity (NFDG), an alternative gravitational model, to some notable cases of galaxies with little or no dark matter.
Gabriele U. Varieschi
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Mass Distribution and Rotation Curve in the Galaxy [PDF]
, 2013 The mass distribution in the Galaxy is determined by dynamical and photometric methods. Rotation curves are the major tool for determining the dynamical mass distribution in the Milky Way and spiral galaxies. The photometric (statistical) method utilizes luminosity profiles from optical and infrared observations, and assumes empirical values of the ...
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Oscillating Cosmological Force Modifies Newtonian Dynamics
Galaxies, 2020 In the Newtonian limit of general relativity a force acting on a test mass in a central gravitational field is conventionally defined by the attractive Newtonian gravity (inverse square) term plus a small repulsive cosmological force, which is ...
Igor I. Smolyaninov
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Dynamics of Molecular Gas in the Central Region of the Quasar I Zwicky 1
The Astrophysical Journal, 2023 We present a study of the molecular gas distribution and kinematics in the cicumnuclear region (radii ≲2 kpc) of the z ≈ 0.061 quasar I Zwicky 1 using a collection of available Atacama Large Millimeter/submillimeter Array observations of the carbon ...
Qinyue Fei +6 more
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Modeling the Rising Tails of Galaxy Rotation Curves [PDF]
Galaxies, 2018 It is well known, but under-appreciated in astrophysical applications, that it is possible for gravity to take on a life of its own in the form of Weyl-curvature-only metrics (note that we are referring to the Weyl-only solutions of ordinary General Relativity; we are not considering Weyl conformal gravity or any other modified gravity theories), as ...
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Magnetic fields: impact on the rotation curve of the Galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 11 pages, 8 figures, accepted for publication in ...
F. J. Sánchez-Salcedo +1 more
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Revisiting Galactic Disk and Spiral Arms Using Open Clusters
The Astronomical Journal, 2023 We use the largest catalog of open clusters in the post-Gaia era to provide an observational view of the Galactic disk. By compiling physical parameters such as age, distance, and kinematic information, we investigate the spatial distribution of open ...
Yogesh C. Joshi, Sagar Malhotra
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Observational Biases on Rotation Curves from Integral Field Unit Data at Cosmic Noon
The Astrophysical JournalThrough studying rotation curves, which depict how the velocity of the stars and gas changes with distance from the center of a galaxy, it has been confirmed that dark matter dominates galaxies’ outer regions, as their rotation curve remains flat ...
Amanda E. Araujo-Carvalho +4 more
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Galaxy rotation curves and dissipation
The Astrophysical Journal, 1989 Une theorie est proposee pour expliquer la tendance des galaxies a disque a manifester des vitesses rotationnelles constantes en considerant l'hypothese suivant laquelle la dissipation d'energie est le facteur principal qui determine les formes finales des galaxies a disque.
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Static State of a Black Hole Supported by Dark Matter
Universe, 2019 The possibility of an equilibrium state of a gravitating scalar field (describing ordinary matter) inside a black hole, compressed to the state of boson condensate, in balance with a longitudinal vector field (describing dark matter) from the outside, is
Boris E. Meierovich
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