Results 41 to 50 of about 64,819 (265)
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
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On the Dwarf Galaxy Rotation Curve Diversity Problem
Galaxies, 2018 In this paper, we show how baryonic physics can solve the problem of the striking diversity in dwarf galaxy rotation curves shapes. To this aim, we compare the distribution of galaxies of the SPARC sample, in the plane V2kpc-VRlast (V2kpc being the ...
Antonino Del Popolo +2 more
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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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Galaxy rotation curves in modified gravity models [PDF]
Journal of Cosmology and Astroparticle Physics, 2018 In this work, we investigate the possibility that the galaxy rotation curves can be explained in the framework of modified gravity models that introduce a Yukawa term in the gravitational potential.
Álefe de Almeida, L. Amendola, V. Niro
semanticscholar +1 more source
Imprints of Chameleon f(R) Gravity on Galaxy Rotation Curves [PDF]
Monthly notices of the Royal Astronomical Society, 2018 Current constraints on gravity are relatively weak on galactic and intergalactic scales. Screened modified gravity models can exhibit complex behaviour there without violating stringent tests of gravity within our Solar System.
A. Naik +3 more
semanticscholar +1 more source
The many reasons that the rotation curves of low-mass galaxies can fail as tracers of their matter distributions [PDF]
Monthly notices of the Royal Astronomical Society, 2023 It is routinely assumed that galaxy rotation curves are equal to their circular velocity curves (modulo some corrections) such that they are good dynamical mass tracers. We take a visualisation-driven approach to exploring the limits of the validity of
E. R. Downing, K. Oman
semanticscholar +1 more source
The Rotation Curves of Galaxies [PDF]
Symposium - International Astronomical Union, 1975 Currently available data on rotation curves are reviewed. For curves derived from optical measurements the distribution of the ratios: the last measured point on a rotation curve to the optical radius of the galaxy has a median value of if Reference Catalogue radii are used and if Holmberg radii are used.
openaire +2 more sources
Is a Bose–Einstein condensate a good candidate for dark matter? A test with galaxy rotation curves [PDF]
, 2019 We analyze the rotation curves that correspond to a Bose--Einstein Condensate (BEC) type halo surrounding a Schwarzschild--type black hole to confront predictions of the model upon observations of galaxy rotation curves.
E. Castellanos +2 more
semanticscholar +1 more source
Conformally-rescaled Schwarzschild metrics do not predict flat galaxy rotation curves
European Physical Journal C: Particles and Fields, 2022 For conformally invariant gravity theories defined on Riemannian spacetime and having the Schwarzschild–de-Sitter (SdS) metric as a solution in the Einstein gauge, we consider whether one may conformally rescale this solution to obtain flat rotation ...
Michael Hobson, Anthony Lasenby
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Dark matter–baryon scaling relations from Einasto halo fits to SPARC galaxy rotation curves [PDF]
Astronomy & Astrophysics, 2018 Dark matter–baryon scaling relations in galaxies are important in order to constrain galaxy formation models. Here, we provide a modern quantitative assessment of these relations by modelling the rotation curves of galaxies from the Spitzer Photometry ...
Amir Ghari +3 more
semanticscholar +1 more source