Mass estimation for systems of galaxies

Details Mass estimation for systems of galaxies Mass estimation for systems of galaxies

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237..319p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 2, Oct. 1990, p. 319-328. Research supported by CSIC and CICYT.

Statistics

Computation

40

Computational Astrophysics, Galactic Clusters, Galactic Mass, Many Body Problem, Astronomical Models, Density Distribution, Luminosity, Mass Spectra, Mass To Light Ratios

Scientific paper

The paper presents the results of N-body simulations aimed at testing the effectiveness of different mass estimators as representatives of the actual mass of galaxy aggregates. The influence of such parameters as absence of virialization, anisotropies in the velocity space, weighting by mass, the existence of substructures, and the presence of interlopers and unbound particles on the virial, projected, and median mass estimators is evaluated. It is concluded that the best mass estimator is the virial mass. The projected mass is affected by interlopers or the presence of substructures, while the median mass is sensitive to subclumps. It cautioned, however, that a method based on the virial mass often results in an overestimation of the actual mass unless the interlopers are eliminated and the estimator is weighted by mass.

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