Globular clusters are a classical probe of the spatial distribution, kinematics, and metallicities in the halo of our Galaxy, but this approach is limited by the finite number of clusters. Surveys of nearby field stars with extreme kinematics or extreme metallicities can also contribute to the ...
This approach enables to estimate an upper limit of the local surface density and (if R_0 is known) a total masses of a disk and a dark halo. We argue that the old stellar disks of spiral galaxies with active star formation usually have the velocity dispersions which are close to the ...
Context.One of the ways to determine the contribution of the dark halo to the gravitational potential of a galaxy is study non-circular (s... I Pérez - 《Astronomy & Astrophysics》 被引量: 0发表: 2008年 Stellar Kinematics of Late-Type Barred Spiral Galaxies We present the results of a ...
Discussing the results, special effort has been devoted to the mutual sensitivity of halo and disk parameters which we understand in a twofold manner: 1) numerical interdependence between the present parameters of the visible Galaxy and the ones of dark matter, and 2) dependence of the bright ...
Clusters more metal-poor than (Fe/H) = -0.8 constitute the familiar halo population, while clusters more metal-rich than (Fe/H) = -0.8 have the properties of a disk system. There is a shallow but significant metallicity gradient with R in the halo population. The central concentrations ...
The outer disk of the Milky Way Galaxy is warped and flared. Several mechanisms have been proposed to explain these phenomena, but none have quantitatively reproduced both features. Recent work has demonstrated that the Galactic stellar halo is tilted wi
A Goswami,N Prantzos 摘要: We present a comprehensive study of the evolution of the abundances of intermediate mass elements, from C to Zn, in the Milky Way halo and in the local disk. We use a consistent model to describe the evolution of those two galactic subsystems. The halo and ...
A bright (V = 15.2) Seyfert 1 galaxy, Mrk 205, will be observed with the G160M mode of GHRS at wavelengths centered on the N V resonance doublet, in an attempt to detect absorption features from hot gas in the disk and halo of a foreground spiral galaxy, NGC 4319. Our objective ...
The nuclear area, disk, and halo contribution to the luminosity is about equal. The starburst nucleus itself is highly absorbed and not visible in the ROSAT band. The emission from the nuclear area stems from a heavily absorbed source with an extent of 250 pc (FWHM) about 100 pc above ...
A relatively thin layer of material distributed in the central plane of a spiral galaxy, in contrast to the nucleus or halo. (biology) Any of various rounded and flattened animal and plant structures. (computer science) A rotating circular plate having a magnetizable surface on which information...