Results 1 to 10 of about 395 (121)
On the Dwarf Galaxy Rotation Curve Diversity Problem [PDF]
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
doaj +5 more sources
Inflation and the dwarf galaxy problem [PDF]
Physical Review D, 2000 Cosmological N-body simulations with scale-invariant initial perturbations show too many virialized objects of dwarf-galaxy masses in a typical galactic halo in contradiction to observation and stability of galactic discs. We present a model of double hybrid inflation which predicts density fluctuations with a small-scale cutoff to account for the ...
Jun’ichi Yokoyama
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A possible dwarf galaxy satellite-of-satellite problem in ΛCDM [PDF]
Astronomy & Astrophysics, 2023 Dark matter clusters on all scales, and it is therefore expected that even substructure should host its own substructure. Using the Extragalactic Distance Database, we searched for dwarf-galaxy satellites of dwarf galaxies, that is, satellite-of-satellite galaxies, corresponding to these substructures of substructure. From investigation of Hubble Space
Oliver Müller +4 more
+6 more sources
The G Dwarf Problem Exists in Other Galaxies [PDF]
The Astronomical Journal, 1996 14 pages, LaTeX includes 3 postscript figures. Uses AAS LaTeX v 4.0 and times.sty. Accepted for publication in the Astronomical Journal.
Worthey, Guy, Dorman, Ben, Jones, Lewis
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The Cusp–Core Problem in Gas-Poor Dwarf Spheroidal Galaxies [PDF]
Galaxies, 2021 This review deals with the inconsistency of inner dark matter density profiles in dwarf galaxies, known as the cusp–core problem. In particular, we aim to focus on gas-poor dwarf galaxies. One of the most promising solutions to this cold dark matter small-scale issue is the stellar feedback, but it seems to be only designed for gas-rich dwarfs. However,
Pierre Boldrini
openaire +5 more sources
The M dwarf problem in the Galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 To be published in Monthly Notices of the RAS by the Royal Astronomical Society and Blackwell Publishing.
Vincent M. Woolf, Andrew A. West
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Missing Dwarf Problem in Galaxy Clusters [PDF]
Publications of the Astronomical Society of Japan, 2007 Abstract We investigated the formation and evolution of CDM subhalos in galaxy-sized and cluster-sized halos by means of $N$-body simulations. Our aim was to make clear what the “dwarf galaxy problem” is. It has been argued that the number of subhalos in simulated galaxy-sized halos is too large compared with the observed number of ...
Kase, Hiroyuki +2 more
openaire +3 more sources
Formation of dwarf galaxies and small-scale problems of CDM [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractThe concordance cosmological model based on cold dark matter makes definitive predictions for the growth of galaxies in the Universe, which are being actively studied using numerical simulations. These predictions appear to contradict the observations of dwarf galaxies.
Oleg Y. Gnedin
openaire +3 more sources
An Internal Second-Parameter Problem in the Sculptor Dwarf Spheroidal Galaxy [PDF]
The Astrophysical Journal, 1999 15 pages, 4 figures, LaTeX, uses aastex.
Majewski, S. R. +3 more
openaire +4 more sources
Inner Halo Shapes of Dwarf Galaxies: Resolving the Cusp/Core Problem [PDF]
Symposium - International Astronomical Union, 2004 We derive inner dark matter halo density profile slopes for a sample of 200 dwarf galaxies by inverting rotation curves obtained from high-quality, long-slit optical spectra. Using simulations to assess the impact of long-slit observing and data processing errors on our measurements, we conclude that our observations are consistent with the cuspy halos
Spekkens, K., Giovanelli, R.
+6 more sources