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发表于 2025-3-26 23:21:40
The Distribution of Dark Matter in Galaxies: Constant-Density Dark Halos Envelop the Stellar Disksalaxies. Their rotation curves, coadded according to the galaxy luminosity, conform to an Universal profile which can be represented as the sum of an exponential thin disk term plus a spherical halo term with a flat density core. From dwarfs to giants, these halos feature a constant density region o
badinage
发表于 2025-3-27 04:57:59
The Amount of Dark Matter in Spiral Galaxies198, 6503, and 7184 are analyzed. For these galaxies the radial velocity dispersions of the stars have been measured. If the parameters of the decompositions are chosen according to the ‘maximum’ disk hypothesis, the Toomre . stability parameter is sytematically less than one, which is a strong argu
残暴
发表于 2025-3-27 08:24:51
Measuring Stellar and Dark Mass Fractions in Spiral Galaxies of spiral galaxies. We perform hydrodynamical simulations of the gas flow in a sequence of potentials with varying the stellar contribution to the total potential. The stellar portion of the potential was derived empirically from K-band photometry. The output of the simulations — namely the gas den
gimmick
发表于 2025-3-27 10:47:19
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ESPY
发表于 2025-3-27 17:15:27
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迫击炮
发表于 2025-3-27 20:09:58
Contribution to Dark Matter from Extragalactic Duste formation of molecules. Many of the grain properties had to be derived from the extinction of starlight, but it has become possible to map its emission in continuum and spectral lines. New, sensitive instruments even allow to map large extragalactic systems..It was found that cold dust (. ≤ 20K) i
疼死我了
发表于 2025-3-28 00:40:32
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四牛在弯曲
发表于 2025-3-28 02:36:53
The Sloan Digital Sky Survey at the Millenniums a smaller area in the south. An array of CCD detectors is used in drift-scan mode to image the sky in five passbands to a limiting magnitude of . ~ 23. Selected from the imaging survey, 10. galaxies, 10. quasars and ~ 10. stars will be observed spectroscopically. To date we have imaged 1700 square
新陈代谢
发表于 2025-3-28 06:46:19
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perjury
发表于 2025-3-28 13:36:27
Can Dark Matter See Itself?iles. This is in stark contrast with observations of both low- and high-surface brightness galaxies, which indicate that the dark matter has almost constant density in the central parts of halos. Basically there are three possible avenues to a solution to the problem, which we discuss in turn. Obser