Results 21 to 30 of about 33,866 (165)
The Structure of Dark Matter Halos in Dwarf Galaxies [PDF]
The Astrophysical Journal, 1995 Some dwarf galaxies have HI rotation curves that are completely dominated by a surrounding dark matter (DM) halo (e.g. Carignan & Freeman 1988). These objects represent ideal candidates for an investigation of the density structure of low-mass DM halos as the uncertainties resulting from the subtraction of the visible component are small, even in ...
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Dark matter halo properties from galaxy–galaxy lensing★ [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 We present results for a galaxy-galaxy lensing study based on imaging data from the Canada-France-Hawaii Telescope Legacy Survey Wide. From a 12 million object multi-colour catalogue for 124 deg^2 of photometric data in the u*g'r'i'z' filters we compute photometric redshifts (with a scatter of σ_{Δz/(1+z)} = 0.033 and an outlier rate of η=2.0 per cent ...
Brimioulle, F. +4 more
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A Tilt in the Dark Matter Halo of the Galaxy
The Astrophysical Journal, 2022 Abstract Recent observations of the stellar halo have uncovered the debris of an ancient merger, Gaia–Sausage–Enceladus (GSE), estimated to have occurred ≳8 Gyr ago. Follow-up studies have associated GSE with a large-scale tilt in the stellar halo that links two well-known stellar overdensities in diagonally opposing octants of the ...
Jiwon Jesse Han +11 more
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Flat Galaxies with Dark Matter Halos—Existence and Stability [PDF]
Communications in Mathematical Physics, 2009 We consider a model for a flat, disk-like galaxy surrounded by a halo of dark matter, namely a Vlasov-Poisson type system with two particle species, the stars which are restricted to the galactic plane and the dark matter particles. These constituents interact only through the gravitational potential which stars and dark matter create collectively ...
Fiřt, Roman +2 more
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The rise and fall of galaxy activity in dark matter haloes [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 We use a SDSS galaxy group catalogue to study the dependence of galaxy activity on stellar mass, halo mass, and group hierarchy (centrals vs. satellites). We split our galaxy sample in star-forming galaxies, galaxies with optical AGN activity and radio sources.
Pasquali, A +4 more
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Ellipticity of dark matter haloes with galaxy-galaxy weak lensing [PDF]
Monthly Notices of the Royal Astronomical Society, 2006 20 pages, 8 figures, matches MNRAS accepted version (includes updated discussion of systematics, no changes to conclusions)
Mandelbaum, Rachel +4 more
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The Astrophysical Journal, 2023 Baryons both increase halo concentration through adiabatic contraction and expel mass through feedback processes. However, it is not well understood how the radiation fields prevalent during the epoch of reionization affect the evolution of concentration
Hanjue Zhu, Nickolay Y. Gnedin
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Physics Letters B, 2020 We discuss formation of dark matter (DM) mini-halos around primordial black holes (PBHs) and its implication on DM direct detection experiments, including axion searches.
Mark P. Hertzberg +2 more
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GRAVISCALAR DARK MATTER AND SMOOTH GALAXY HALOS [PDF]
Modern Physics Letters A, 2009 In the framework of the unimodular metagravity, with the scalar graviton/graviscalar dark matter, a regular anomalous one-parameter solution to the static spherically symmetric metagravity equations in empty space is found. The solution presents a smooth graviscalar halo, with a finite central density profile, qualitatively reproducing the ...
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The 6dF Galaxy Survey: Dependence of halo occupation on stellar mass [PDF]
, 2012 In this paper we study the stellar-mass dependence of galaxy clustering in the 6dF Galaxy Survey. The near-infrared selection of 6dFGS allows more reliable stellar mass estimates compared to optical bands used in other galaxy surveys.
Beutler, Florian +8 more
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