spiral structure Ghost matter astrophysics.6: Spiral structure (p7)
Fig. 13d: The galaxy with its surrounding anti-galaxy. Eight turns. Dynamical friction ceases. The anti-galaxy becomes clustered. Tidal effects become dominant.
Fig. 13e: The galaxy with its surrounding anti-galaxy. Ten turns. A barred spiral emerges.
Fig. 13f: The galaxy with its surrounding anti-galaxy. Twelve turns. The barred spiral is fully developed and remains stable over 50 turns. No significant change.
Fig. 13g: The visible stable barred galaxy.
The reader will ask: "What is the meaning of these clumps of ghost matter, all around?" The answer is: none. Although image 13 looks very appealing, it is definitively not a realistic galaxy, nor a correct configuration of a galaxy coupled to its ghost matter environment. The results are purely qualitative. All we can conclude is:
- When a 2D rotating matter clump interacts with a ring of ghost matter, a system consisting of a bar and two arms forms, remarkably stable over time.