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| A Method of Obtaining the Pitch Angle of Spiral Arms and the Inclination of Galactic Discs | |
| 摘 要： | RESEARCH PAPERS 1 INTRODUCTIONA spiraI gaIaxy inherently consists of a halo, a bulge and a thin disc with spiral structurewhich emerges from the central region or the end of a bright bar. Optical images of spirals, whichare projections on the celestial sphere, are dominated by the light from the stars, as modifiedby the extinction and reddening of dust. AIthough Lord Rosse first discovered that M51 hastwo spiral arms in 1845, the form of the spiral structure had not been investigat… |
| 关 键 词： | 银河系 银盘 倾角 对称性 |
A Method of Obtaining the Pitch Angle of Spiral Arms and the Inclination of Galactic Discs |
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| Abstract: | |
| Keywords: | galaxies: spiral galaxies - galaxies: spiral arm disc: inclination |