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Empirical properties of nearby groups of galaxies
Author(s) -
Vennik J.
Publication year - 1986
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2113070302
Subject(s) - virial mass , astrophysics , physics , uncorrelated , galaxy , virial theorem , luminosity , galaxy group , group (periodic table) , virial coefficient , luminous infrared galaxy , mathematics , statistics , thermodynamics , quantum mechanics
Virial parameters of individual groups and of synthesized groups of galaxies are determined on the basis of a new list of nearby groups of galaxies ( V 0 < 3200 km/s). Small values of the crossing time ({ T cros H 0 } ≈ 0.2) allow us to consider the groups of being gravitationally bound systems. The cumulative mass of the synthesized groups increases up to ∼1 Mpc from the center, giving the total mass‐to‐luminosity ratio f = 97 f ⊙ ( H 0 = 75 km/s/Mpc). Statistically significant correlations between virial parameters (σ v , R VT, f ) are found: f ∝ σ v 1.5 and f ∝ R VT 0.7 ; σ v and R VT are uncorrelated.