The G-dwarf problem in the Galaxy [PDF]
New Astronomy, 2008 The empirical differential metallicity distribution (EDMD) is deduced for (i) local thick disk stars; (ii) likely metal-weak thick disk stars; (iii) chemically selected local G dwarfs, with the corrections performed in order to take into account the stellar scale height; in addition to previous results related to (iv) solar neighbourhood halo subdwarfs;
R. Caimmi
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Dwarf galaxy rotation curves and the core problem of dark matter haloes [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 33 pages, 24 figures. Accepted for publication in MNRAS.
Bosch, Frank C. van den, Swaters, Rob A.
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Unstable Cold Dark Matter and the Cuspy Halo Problem in Dwarf Galaxies [PDF]
The Astrophysical Journal, 2003 5 pages, 1 figure, accepted for publication in ...
F. J. Snchez-Salcedo
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A New Culprit in the Second-Parameter Problem in the Sculptor Dwarf Spheroidal Galaxy? [PDF]
The Astrophysical Journal, 1999 Color-magnitude diagrams from deep, wide-field CCD photometry of the Sculptor dwarf spheroidal galaxy reveal that the red horizonal branch (RHB) stars are strongly concentrated towards the center of the galaxy relative to the dominant old population in Sculptor, confirming an earlier claim of such a gradient (Da Costa et al. 1996).
Hurley-Keller, D., Mateo, M., Grebel, E.
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Orbits and adiabatic contraction in scalar-field dark matter halos: revisiting the cusp-core problem in dwarf galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT Bose–Einstein-condensed dark matter, also called scalar field dark matter (SFDM), has become a popular alternative to cold dark matter (CDM), because it predicts galactic cores, in contrast to the cusps of CDM halos (‘cusp-core problem’).
Pils, Kevin, Rindler-Daller, Tanja
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The Rotation Curves of Dwarf Galaxies: A Problem for Cold Dark Matter? [PDF]
The Astrophysical Journal, 2004 We address the issue of accuracy in recovering density profiles from observations of rotation curves of galaxies. We ``observe'' and analyze our models in much the same way as observers do the real galaxies. We find that the tilted ring model analysis produces an underestimate of the central rotational velocity.
Rhee, George +4 more
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Is The Vast Polar Structure Of Dwarf Galaxies A Serious Problem For ΛCDM? [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 14 pages, 6 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society.
Andrew Lipnicky, Sukanya Chakrabarti
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New Type Ia Supernova Yields and the Manganese and Nickel Problems in the Milky Way and Dwarf Spheroidal Galaxies [PDF]
The Astrophysical Journal, 2020 Abstract In our quest to identify the progenitors of Type Ia supernovae (SNe Ia), we first update the nucleosynthesis yields for both near-Chandrasekhar- (Ch) and sub-Ch-mass white dwarfs (WDs) for a wide range of metallicities with our 2D hydrodynamical code and the latest nuclear reaction rates.
Chiaki Kobayashi +2 more
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Chemical Evolution of Elliptical Galaxies: Mg2 Gradients and G-Dwarf Problem [PDF]
Highlights of Astronomy, 1998 Stellar populations of elliptical galaxies were studied extensively in the recent past (eg., Arimoto & Yoshii 1987; Buzzoni et al. 1992; Worthey 1994; Kodama & Arimoto 1997). However, colours and line-strengths analysed by these approaches came mainly from central regions of galaxies and possible variations of stellar population structure ...
N. Arimoto, C. Kobayashi
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An analytical approach to the dwarf galaxies cusp problem [PDF]
Astronomy & Astrophysics, 2010 An analytical solution for the discrepancy between observed core-like profiles and predicted cusp profiles in dark matter halos is studied. We calculate the distribution function for Navarro-Frenk-White halos and extract energy from the distribution, taking into account the effects of baryonic physics processes.
de Souza, Rafael S. +1 more
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