A high-resolution rotation curve of NGC 6822: a test-case for cold dark matter
نویسندگان
چکیده
منابع مشابه
Figure Rotation of Dark Halos in Cold Dark Matter Simulations
We investigate the figure rotation of dark matter halos identified in ΛCDM simulations. We find that when strict criteria are used to select suitable halos for study, 5 of the 222 halos identified in our z=0 simulation output undergo coherent figure rotation over a 5 h Gyr period. We discuss the effects of varying the selection criteria and find that pattern speeds for a much larger fraction of...
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In the current concordance cosmology, 23% of the universe’s total energy density is contributed by exotic dark matter [1]. The axion, arising from the Peccei-Quinn solution to the strong CP problem [2], satisfies the two criteria necessary for cold dark matter [3]: (1) a very cold population of axions could be present in our universe in sufficient quantities to provide the required dark matter ...
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15 صفحه اولHigh-resolution Measurements of the Dark Matter Halo of Ngc 2976: Evidence for a Shallow Density Profile
We have obtained two-dimensional velocity fields of the dwarf spiral galaxy NGC 2976 in Hα and CO. The high spatial (∼ 75 pc) and spectral (13 km s and 2 km s, respectively) resolution of these observations, along with our multicolor optical and near-infrared imaging, allow us to measure the shape of the density profile of the dark matter halo with good precision. We find that the total (baryon...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2003
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2003.06170.x