Vertical scaleheights in a gravitationally coupled, three-component Galactic disk
نویسندگان
چکیده
منابع مشابه
Vertical distribution of Galactic disk stars ⋆
Nearly 400 Tycho-2 stars have been observed in a 720 square degree field in the direction of the North Galactic Pole with the high resolution echelle spectrograph ELODIE. Absolute magnitudes, effective temperatures, gravities and metallicities have been estimated, as well as distances and 3D velocities. Most of these stars are clump giants and span typical distances from 200 pc to 800 pc to the...
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We examine the vertical structure and equilibrium of the molecular gas layer in the galactic disk, measuring its scale height and velocity dispersion as a function of Galactic radius by modeling the CO emission at the tangent points. The model takes into account emission from a large path length along the line of sight, corresponding to an interval (∆R) of typically a few hundred parsecs in gal...
متن کاملVertical distribution of Galactic disk stars : ⋆ II . The surface mass density in the Galactic plane
High resolution spectra data of red clump stars towards the NGP have been obtained with the high resolution spectrograph Elodie at OHP for Tycho-2 selected stars. Combined with Hipparcos local analogues, we determine both the gravitational force law perpendicular to the Galactic plane, and the total surface mass density and thickness of the Galactic disk. The surface mass density of the Galacti...
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In a composite fluid system of two gravitationally coupled barotropic scale-free discs bearing a rotation curve v ∝ r and a power-law surface mass density Σ0 ∝ r −α with α = 1 + 2β, we construct coplanar stationary aligned and spiral perturbation configurations in the two discs. Due to the mutual gravitational interaction, there are two independent classes of perturbation modes with surface mas...
متن کاملNonlinear Spiral Waves in a Galactic Disk
1. The hypothesis of density waves was proposed in [1] to explain the spiral design of spiral galaxies. Spiral density waves in the linear approximation were conn structed in [2] for a galactic disk described by hydrodyy namic or collisionless kinetic equations. Serious diffii culties are inherent in the model proposed in [2], which remained topical until recently. First, it was shown in [3] th...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2002
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20021128