Groups of galaxies. II. Determination of the values of selection parameters |
| |
| Authors: | A P Mahtessian |
| |
| Institution: | (1) Byurakan Astrophysical Observatory, Armenia |
| |
| Abstract: | The CfAl Catalog of Huchra et al. is examined for identification of groups of galaxies with the use of a variation of the
percolation method previously used by Huchra and Geller. The main difference between our method and Huchra-Geller method is
in the selection criterion for components. We use the value of the gravitational field potential to determine component galaxies.
This approach is physically more valid than the distances between galaxies. It is shown that the selection parameters E0 and V0 need not be changed with distance to account for changes in the observed luminosity function of galaxies. Thus, it is unnecessary
in our approach to use the luminosity function of galaxies for identification of groups. The dependence of the main characteristics
of groups on the selection parameters is investigated. The interval of the selection parameters within which the group characteristics
are least dependent on these parameters is determined. Groups of galaxies detected with any pairs of E0 and V0 values from these intervals can be considered essentially real.
Translated fromAstrofizika, Vol. 40, No. 1, pp. 45–60, February, 1997. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
