Interaction between the Galactic Disk and Halo Components
نویسندگان
چکیده
منابع مشابه
Interaction between a galactic disk and a live dark halo with an anisotropic velocity distribution
We have extended previous analytical studies of the interaction of dark halos with galactic disks by introducing for the halo particles anisotropic distribution functions in phase space. For this purpose we have employed the shearing sheet model of a patch of a galactic disk embedded in a homogeneous halo. We find that velocity anisotropy increases considerably the maximum growth factor of pert...
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The results of a three-dimensional model for disk-halo interaction are presented here. The model considers explicitly the input of energy and mass by isolated and correlated supernovae in the disk. Once disrupted by the explosions, the disk never returns to its initial state. Instead it approaches a state where a thin HI disk is formed in the Galactic plane overlayed by thick HI and HII gas dis...
متن کاملNearby stars of the Galactic disk and halo
Model atmosphere analyses of échelle spectra of some fifty nearby Fand G-type stars are presented. The sample is confined to the main-sequence, turnoff and subgiant region, regardless of the metal abundance. On the base of these data, spectroscopic parallaxes are calculated and compared to the Hipparcos astrometry to explore the reliability of the derived stellar parameters, notably the surface...
متن کاملStructure of the Galactic Stellar Halo Prior to Disk Formation
We develop a method for recovering the global density distribution of the ancient Galactic stellar halo prior to disk formation, based on the present orbits of metal-poor stars observed in the solar neighborhood. The method relies on the adiabatic invariance of the action integrals of motion for the halo population during the slow accumulation of a disk component, subsequent to earlier halo for...
متن کاملConference Summary: Themes and Questions about the Disk-halo Interaction
The papers in this volume represent a broad spectrum of observational, theoretical, and computational astrophysics, sharing as a unifying core the Disk-Halo Interaction in the Milky Way and other spiral galaxies. This topic covers a wide range of Galactic and extragalactic research, built on a foundation of numerous and diverse physical processes. This summary groups the papers according to six...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1977
ISSN: 0252-9211
DOI: 10.1017/s0252921100067610