Faber-Jackson Relation: Explained | Shounak

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    Jackson Relation
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The Faber-Jackson relation indicates a direct correlation between the luminosity of elliptical galaxies and their velocity dispersion, suggesting that higher luminosity corresponds to higher velocity dispersion. The discussion also touches on the Tully-Fisher relation, which similarly relates luminosity to velocity dispersion but is applicable to spiral galaxies. Users seek clarification on the derivation of the equation L ∝ σ^γ and whether the Tully-Fisher model is essentially the same as the Faber-Jackson relation, differing only by galaxy type. Additionally, there is curiosity about the models used for calculating properties in irregular galaxies. The conversation emphasizes the need for patience in awaiting responses to complex astrophysical questions.
shounakbhatta
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Hello,

What does the Faber Jackson relation tells?
Does it establish the relation between: higher the Luminosity, higher the velocity dispersion?

Does it calculate in Elliptical galaxies?

What does Tully-Fisher relation explains?

-- Shounak
 
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Is Faber Jackson relation shows a directly proportional relation to the velocity dispersion?
 
Can somebody please explain the derivation of the equation L <alpha> sigma times gamma?
 
Is Tully Fisher model used in calculating the relation between luminosity and dispersion velocity in spiral galaxy?

Is Tully Fisher model and Faber Jackson are same except they are used in spiral and elliptical galaxy?

What model is used to calculate irregular galaxies?
 
Easy buddy, one question at a time. Give the thread a few days for someone to reply before bumping it back up.
 

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