手段
发表于 2025-3-23 11:19:31
THE DISK MASS PROJECTral galaxies. This will provide a kinematic measurement of the stellar disk mass required to break the degeneracy, enabling us to determine the dark matter properties in spiral galaxies with unprecedented accuracy. Here we present preliminary results for three galaxies with different central disk surface brightness levels.
fender
发表于 2025-3-23 15:14:08
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象形文字
发表于 2025-3-23 19:36:21
EXTRAGALACTIC THICK DISKSdisks have old ages, low metallicities, long scale lengths, and moderately flattened axial ratios, much like the thick disk of the MilkyWay. However, the properties of thick disks change systematically with the mass of the galaxy. The thick disks of low mass galaxies are more prominent and somewhat
高贵领导
发表于 2025-3-24 01:24:31
THE OPACITY OF SPIRAL GALAXY DISKS than the dust extinction, Gonzalez et al. (1998) developed the “Synthetic Field Method”. A synthetic field is an extincted Hubble Deep Field added to the science field. The relation between the dimming and the number of retrieved synthetic galaxies calibrates the number found in the science field.
Concomitant
发表于 2025-3-24 05:43:14
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Pericarditis
发表于 2025-3-24 07:26:07
THE THIN AND THICK DISKS OF THE GALAXY: DIFFERENCES IN EVOLUTIONisk is divided in two zones — the thin and thick disks, which separate chemically and spatially and have different evolution timescales. The Galactic evolution of magnesium was investigated for the thin and thick disks. The obtained results show that the star formation history of the thin disk is mo
松紧带
发表于 2025-3-24 14:35:33
THE MILKY WAY AND THE TULLY–FISHER RELATION“Solar cylinder” calibrated to reproduce Hipparcos and Tycho star counts. We discuss the mass-to-light ratio of the local stellar disc and infer the global luminosity of the MilkyWay, which indicates it is underluminous with respect to the Tully–Fisher relation.
magnanimity
发表于 2025-3-24 17:26:02
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Formidable
发表于 2025-3-24 19:20:03
DYNAMICS OF DISKSarps. It has been suggested at age ~ 3 Gyr the random velocity of a star saturates, but I show that this conjecture is excluded by Hipparcos data. Spiral structure dominates the heating of disks, but spirals don’t just heat disks, they churn them. In the solar neighbourhood churning is required to e
淡紫色花
发表于 2025-3-25 02:57:18
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