12. http://www.mso.anu.edu.au/~kcf/surya/spiralstructure/Fuchs02a
... of density wave theory of galactic spiral arms are then used to estimate the masses ... from density wave theory of galactic spiral arms may provide such constraints ... the density wave theory of galactic spiral arms, I have inspected images of each ...
13. Spiral Galaxies Stripped Bare | ESO
... obscuring dust in the galaxiesтАЩ spiral arms becomes transparent to its detectors ... gas it is ideal for studying the vast numbers of stars that make up spiral arms ... galaxy тАФ a class of galaxies with very prominent and well-defined spiral arms ...
14. http://zebu.uoregon.edu/messier/m91.txt
... It is a weakly barred galaxy with spiral arms emanating from the ends of the bar. ... CCD frame clearly shows the bar a little more clearly and shows the smooth spiral arms as outlined by an old stellar population ...
18. Phil Plait's Bad Astronomy: Q and BA
... The spiral arms are actually part of a disk of stars and gas and dust. ... the center, a rectangular bar and the spiral arms emanate from the ends of those ... looking down on it, you can see those spiral arms, and it's pretty easy to tell it's ...
19. http://www.aaa.org/s932/images/09fallclass4.pdf
... is the current most viable model for the spiral arms observed in spiral galaxies ... This theory holds that the spiral arms are waves of gas compression and star ... the bulges become smaller while the spiral arms tend to become less tightly wound ...
20. http://ip.rsu.ru/~vorobyov/cv.pdf
... up in regions with strongly perturbed mass distributions, i.e. near the spiral arms ... large at the convex edge of the spiral arms, whereas they are small at the concave ...