Measuring the Virial Masses of Disk Galaxies

Details Measuring the Virial Masses of Disk Galaxies Measuring the Virial Masses of Disk Galaxies

2002-01-02

arxiv.org/abs/astro-ph/0201006v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 fig. To appear in proceedings of "The Mass of Galaxies at Low and High Redshift", eds. R. Bender and A. Renzini (ES

Scientific paper

10.1007/10899892_64

I present detailed models for the formation of disk galaxies, and investigate which observables are best suited as virial mass estimators. Contrary to naive expectations, the luminosities and circular velocities of disk galaxies are extremely poor indicators of total virial mass. Instead, I show that the product of disk scale length and rotation velocity squared yields a much more robust estimate. Finally, I show how this estimator may be used to put limits on the efficiencies of cooling and feedback during the process of galaxy formation.

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