SUMMARY
The Faber-Jackson relation establishes a direct correlation between the luminosity of elliptical galaxies and their velocity dispersion, indicating that higher luminosity corresponds to higher velocity dispersion. The equation L ∝ σ^γ describes this relationship, where L represents luminosity and σ denotes velocity dispersion. The Tully-Fisher relation, on the other hand, applies to spiral galaxies, linking their luminosity to rotational velocity. Both models serve to understand the dynamics of different galaxy types, with the Faber-Jackson relation specifically focusing on elliptical galaxies.
PREREQUISITES
- Understanding of the Faber-Jackson relation
- Familiarity with the Tully-Fisher relation
- Basic knowledge of galaxy classifications (elliptical and spiral)
- Concept of velocity dispersion in astrophysics
NEXT STEPS
- Research the derivation of the Faber-Jackson relation equation L ∝ σ^γ
- Study the Tully-Fisher relation and its applications in spiral galaxies
- Explore models used for calculating properties of irregular galaxies
- Investigate the implications of luminosity and velocity dispersion in galaxy formation theories
USEFUL FOR
Astronomers, astrophysics students, and researchers interested in galaxy dynamics and the relationships between luminosity and velocity dispersion in different types of galaxies.