Velocity Fields in Spiral Galaxies
نویسندگان
چکیده
منابع مشابه
Moss: Magnetic fields in spiral galaxies
The first hints that our galaxy, the Milky Way, might host a large-scale magnetic field came in the late 1940s, from studies of the polarization of starlight. However, optical polarization is a relatively blunt tool and it was only in the late 1950s that radio synchroton observations began to indicate the presence of large-scale fields (e.g. Gardner and Davies 1966). By the early 1980s observat...
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Investigation of the symmetry of the majorand minor-axis rotation curves reveals strong evidence of nonconcentric gas orbits with the maximum center shift of D300 pc. Comparisons between kinematic and photometric structure (e.g., position angles, inclinations, centers) show considerable noise on small scales. Although large-scale averages are in agreement, this noise is a matter of some concern...
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Two dimensional velocity fields have been an important tool for nearly 30 years and are instrumental in understanding galactic mass distributions and deviations from an ideal galactic disk. Recently a number of new instruments have started to produce more detailed velocity fields of the disks and nuclear regions of galaxies. This paper summarizes some of the underlying techniques for constructi...
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We present a simplified model in which we suggest that two important galactic problems -the magnetic field configuration at large scales and the flat rotation curvemay be simultaneously explained. A highly convective disc produces a high turbulent magnetic diffusion in the vertical direction, stablishing a merging of extragalactic and galactic magnetic fields. The outer disc may then adquire a ...
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We present a numerical study of the properties of the stellar velocity distribution in stellar discs which have developed a saturated, two-armed spiral structure. We follow the growth of the spiral structure deeply into the non-linear regime by solving the Boltzmann moment equations up to second order. By adopting the thin-disc approximation, we restrict our study of the stellar velocity distri...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1999
ISSN: 0074-1809
DOI: 10.1017/s0074180900162096