Results 21 to 30 of about 51,405 (265)
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.
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Galactic rotation dynamics in a new $$f({\mathcal {R}})$$ f ( R ) gravity model
European Physical Journal C: Particles and Fields, 2023 We propose to test the viability of the recently introduced $$f(\mathcal {R})$$ f ( R ) gravity model in the galactic scales. For this purpose we consider test particles moving in stable circular orbits around the galactic center.
Nashiba Parbin, Umananda Dev Goswami
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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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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
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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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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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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Disk Galaxies Are Self-similar: The Universality of the H i-to-Halo Mass Ratio for Isolated Disks
The Astrophysical Journal Letters, 2023 Observed scaling relations in galaxies between baryons and dark matter global properties are key to shed light on the process of galaxy formation and on the nature of dark matter.
Marie Korsaga +9 more
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Understanding galaxy rotation curves with Verlinde’s emergent gravity
Classical and Quantum Gravity, 2022 Abstract We present the results from the analysis of galaxy rotation curves with Verlinde’s emergent gravity. We use the data in the Spitzer Photometry and Accurate Rotation Curves database, which contains a sample of 175 nearby disk galaxies with 3.6 µm surface photometry and rotation curves. We compute the gravitational acceleration at
Youngsub Yoon +2 more
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Rotation Curves of Spiral Galaxies [PDF]
Annual Review of Astronomy and Astrophysics, 2001 ▪ Abstract Rotation curves of spiral galaxies are the major tool for determining the distribution of mass in spiral galaxies. They provide fundamental information for understanding the dynamics, evolution, and formation of spiral galaxies. We describe various methods to derive rotation curves and review the results obtained.
Sofue, Yoshiaki, Rubin, Vera
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