About this Image
M83 was classified as intermediate between normal and barred spiral galaxies by G. de Vaucouleurs, in his classification this is SAB(s)c.
It is showing very well defined spiral arms and displays a very dynamic appearance, appealing by the red and blue knots tracing the arms.
The red knots are apparently diffuse gaseous nebulae in which star formation is just taking place, and which are excited to shine by its very hot young stars.
The blue regions represent young stellar populations which have formed shortly (i.e., some million or some dozens of million years ago).
Between the pronounced spiral arms are regions with fewer stars.
20 " Keller cassegrain in corrected secondary focus at f/9
|Camera||SBIG STL-11000M at -25C, 8-pos STL filter wheel|
|Date||May 02, 2008|
|Sky Conditions||dark skies, raw FWHM 1.5-2.1" temperature 15 C,|
L:R:G:B = 90:30:30:30 minutes (15-minute sub-exposures);
Maxim DL 4.5;