A Comparison of Simple Galaxy Mass Estimators
Weil, Melinda L.
Original · EN
The virial, projected and spherical Jeans equation galaxy mass estimators are compared. High-resolution models of elliptical galaxies from N-body simulations are used to compare predicted mass profiles. Averages over eight models and directions in the three intrinsic projections show that all the mass estimators are comparably poor for r<4 kpc but that, with the exception of the projected mass estimator, errors are within approximately 10 - 20% out to r=40 kpc. Because kinematic data for elliptical galaxies are now available out to several effective radii, mass estimation techniques which are simple to apply can provide mass profiles and mass-to-light ratios at large radii.
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