Projection effects and virial masses of groups of galaxies

Details Projection effects and virial masses of groups of galaxies Projection effects and virial masses of groups of galaxies

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..777d&link_type=abstract

Astrophysical Journal, Part 1, vol. 244, Mar. 15, 1981, p. 777-779. Research supported by the Consiglio Nazionale delle Ricerch

Astronomy and Astrophysics

Astrophysics

6

Galactic Clusters, Mass Distribution, Mathematical Models, Virial Theorem, Correlation, Mass Ratios, Radii, Random Numbers

Scientific paper

It is demonstrated that the contribution of projection effects to the dispersion of virial mass-to-light ratios for groups of galaxies may be considerably larger than previously believed, especially if the number of dynamically relevant members is small, as is frequently the case. It is also shown that earlier estimates are vitiated by several incorrect approximations, which leads to an overestimate of the uncertainty associated with the determination of the virial radius and to an underestimate of that pertinent to the velocity dispersion.

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