想象
发表于 2025-3-30 08:37:44
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别炫耀
发表于 2025-3-30 12:59:50
https://doi.org/10.1057/9780312299187etween 0.1 and 5 pc radius from the dynamic center now strongly favor the existence of a central dark mass of 2.5 to 3.3×10. M. within 0.1 pc of the dynamic center. This central dark mass cannot be a cluster of neutron stars. It is either a compact cluster of stellar black holes or, most likely, a single massive black hole.
AMBI
发表于 2025-3-30 19:19:24
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Devastate
发表于 2025-3-31 00:36:18
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Cuisine
发表于 2025-3-31 01:37:14
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天空
发表于 2025-3-31 06:01:54
Orbits in barred galaxies,parison of our method with Laskar‘s frequency analysis method is made. In 3-D systems we define one spectrum for stretching numbers and three spectra for helicity angles. A clear distinction between Arnold diffusion and resonance overlap diffusion is made.
支形吊灯
发表于 2025-3-31 11:12:50
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宽度
发表于 2025-3-31 16:02:38
The pattern speed of the Galactic bulge,persion ratios in Baade‘s window. From the velocity dispersion in Baade‘s window, and an assumed distance of 8 kpc to the Galactic center we obtain a mass of 2.7×10. M. and a pattern speed of 39 km s. kpc..
翻动
发表于 2025-3-31 20:28:46
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CODE
发表于 2025-4-1 00:03:31
The galactic center dynamics,potential serves as a source of excitation of the density wave. In the both cases, the generated spiral density wave is consistent with the observed ‘mini-spiral’ if the upper limit to the black hole mass is ≅10.M..