Results 41 to 50 of about 635,843 (204)
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
Kristine Spekkens, Riccardo Giovanelli
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Dwarf Galaxies of the Local Group [PDF]
Ann.Rev.Astron.Astrophys.36:435-506,1998, 1998 The Local Group (LG) dwarf galaxies offer a unique window to the detailed properties of the most common type of galaxy in the Universe. In this review, I update the census of LG dwarfs based on the most recent distance and radial velocity determinations.
M. Mateo
arxiv +3 more sources
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, Chiaki Kobayashi
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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’).
Kevin Pils, Tanja Rindler-Daller
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Perseus I and the NGC 3109 association in the context of the Local Group dwarf galaxy structures [PDF]
2014, MNRAS, 440, 908, 2014 The recently discovered dwarf galaxy Perseus I appears to be associated with the dominant plane of non-satellite galaxies in the Local Group (LG). We predict its velocity dispersion and those of the other isolated dSphs Cetus and Tucana to be 6.5, 8.2, and 5.5 km/s, respectively.
M. Pawlowski, S. McGaugh
arxiv +3 more sources
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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Dwarf Galaxies in the MATLAS Survey: The satellite system of NGC474 under scrutiny with MUSE [PDF]
A&A 693, A44 (2025)A recent study of the distribution of dwarf galaxies in the MATLAS sample in galaxy groups revealed an excess of flattened satellite structures, reminiscent of the co-rotating planes of dwarf galaxies discovered in the local Universe. If confirmed, this lends credence to the plane-of-satellite problem and further challenges the standard model of ...
O. Muller +14 more
arxiv +3 more sources
INTERGALACTIC GAS IN GROUPS OF GALAXIES: IMPLICATIONS FOR DWARF SPHEROIDAL FORMATION AND THE MISSING BARYONS PROBLEM [PDF]
The Astrophysical Journal, 2011 9 pages, 7 figures, accepted for publication in ...
Emily Freeland, Eric Wilcots
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The cusp-core problem in dwarf galaxies : new solutions
, 2020 Cette thèse porte sur la nature de la matière noire (MN) et plus particulièrement sur le problème de la disparité des profils de densité interne de MN dans les galaxies naines, le problème « cusp-core". Nous avons commencé par réétudier ce problème pour la galaxie naine, Fornax, en utilisant la distribution spatiale et de masse des amas globulaires ...
Pierre Boldrini
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SDSS-IV MaNGA: the ‘G-dwarf problem’ revisited [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2021 The levels of heavy elements in stars are the product of enhancement by previous stellar generations, and the distribution of this metallicity among the population contains clues to the process by which a galaxy formed.
M. Greener +5 more
semanticscholar +1 more source