Results 31 to 40 of about 106,851 (294)
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
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Rotation Curves of 967 Spiral Galaxies [PDF]
The Astrophysical Journal Supplement Series, 1995 We present the rotation curves (RCs) of 967 spiral galaxies, obtained by folding and deprojecting the raw optical data by Mathewson et al. (1992). Out of these, we have identified 80 excellent RCs and 820 fair RCs. The 80 excellent RCs are smooth, symmetric, have negligible rms internal error, extend to at least the optical radius, and have high and ...
Persic, M., Salucci, P.
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Influence of Magnetic Fields on the Gas Rotation in the Galaxy NGC 6946
The Astrophysical Journal, 2023 Magnetic fields can play an important role in the energy balance and formation of gas structures in galaxies. However, their dynamical effect on the rotation curve of galaxies is immensely unexplored.
M. Khademi, S. Nasiri, F. S. Tabatabaei
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The universal rotation curve of spiral galaxies [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2006 Abstract The observed strong dark-to-luminous matter coupling is described by a bias relation between visible and dark matter sources. We discuss the bias which emerges in the case where the topological structure of the Universe at very large distances does not properly match that of the Friedman space. With the use of such ‘topological’
Kirillov, AA, Turaev, D
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Chemie Ingenieur Technik, EarlyView., 2023 Let us consider an alternative perspective on climate change: The sum of solar radiation and heat generated by human activity result in a net energy input of 1.96 times that of the Sun on the Earth's surface. The expanding global population is expected to exacerbate this issue. Potential solutions are proposed, including replacement and heat recycling.
Martin Bertau, Gerald Steiner
wiley +1 more source
Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation Curves
Universe, 2021 The flattening of spiral-galaxy rotation curves is unnatural in view of the expectations from Kepler’s third law and a central mass. It is interesting, however, that the radius-independence velocity is what one expects in one less dimension. In our three-
Felipe J. Llanes-Estrada
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Rotation curve fitting and its fatal attraction to cores in realistically simulated galaxy observations [PDF]
, 2016 We study the role of systematic effects in observational studies of the cusp–core problem under the minimum disc approximation using a suite of high-resolution (25-pc softening length) hydrodynamical simulations of dwarf galaxies.
J. Pineda +3 more
semanticscholar +1 more source
Galaxies with Declining Rotation Curves [PDF]
Astronomy Reports, 2020 A sample of 22 spiral galaxies compiled from published data is studied. The galaxy rotation curves pass through a maximum distance of more than $\sim 1$ kpc from the center with a subsequent decrease in the rotation velocity. The galaxy position in the Tully-Fisher (TF) and baryonic Tully-Fisher (BTF) diagrams show that the values of maximum rotation ...
Zobnina, D. I., Zasov, A. V.
openaire +2 more sources
On the estimation of the local dark matter density using the rotation curve of the Milky Way [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 The rotation curve of the Milky Way is commonly used to estimate the local dark matter density ρDM,⊙. However, the estimates are subject to the choice of the distribution of baryons needed in this type of studies. In this work we explore several Galactic
P. F. D. Salas +6 more
semanticscholar +1 more source
An alternative mass model for galactic dark coronae [PDF]
Serbian Astronomical Journal, 2001 A spherically symmetric mass distribution with two scale parameters for the dark corona of a (spiral) galaxy as an alternative to the usually applied quasi-isothermal sphere is considered.
Ninković S.
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