Mass Profile in Elliptical Galaxies

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SUMMARY

The discussion focuses on the mass density profile of elliptical galaxies, emphasizing the challenges in obtaining empirical data due to their obscured structures. Participants seek non-theoretical data on mass distribution at varying radii from the center, acknowledging that elliptical galaxies are not typically spherical. The conversation highlights the limitations of using radius (R) and cylindrical coordinates (r, z) for accurately describing their shapes. Additionally, it references de Vaucouleurs' law as an empirical fit for luminosity in these galaxies.

PREREQUISITES
  • Understanding of elliptical galaxy morphology
  • Familiarity with mass density profiles in astrophysics
  • Knowledge of de Vaucouleurs' law
  • Basic concepts of observational astronomy and viewing angles
NEXT STEPS
  • Research empirical methods for measuring mass density profiles in elliptical galaxies
  • Study the application of de Vaucouleurs' law in astrophysical contexts
  • Explore 3D modeling techniques for galaxy structures
  • Investigate the impact of viewing angles on the interpretation of galaxy shapes
USEFUL FOR

Astronomers, astrophysicists, and students interested in galaxy morphology and mass distribution, particularly those focusing on elliptical galaxies.

RCopernicus
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We know a fair amount about Spiral Galaxies because we can basically see their guts. Elliptical Galaxies are obscured by the outer shell. Can anyone direct me to some non-theoretical data on the mass (density) profile of Elliptical galaxies (i.e. the amount of mass (or density) at a given radius, R, from the center)?
 
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Ellipticals are not necessarily (or usually) spherical, so R is not a very good variable to discuss their shapes. Neither, really is r, because it depends on z. Also, we don't have a really good 3-d picture of these galaxies because of the unknown viewing angle. There are empirical fits to luminosities like de Vaucouleurs' law.
 

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