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Total mass beyond r 200 for systems with different density profile laws within a Λ background
Author(s) -
Teerikorpi P.,
Heinämäki P.,
Chernin A. D.
Publication year - 2018
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.201813529
Subject(s) - physics , radius , virial theorem , galaxy , astrophysics , virial mass , halo , zero (linguistics) , isothermal process , thermodynamics , linguistics , philosophy , computer security , computer science
Virial masses within some radius in a galaxy system tend to undervalue the true total mass. Here, we quantify this effect for the standard mass M ( r 200 ) up to the radius within which the mean density is 200 ρ crit . We derive the masses up to the zero‐gravity radius r max , for a few common density profile laws: the isothermal, the Hernquist, and the Navarro–Frenk–White profiles, relative to the mass M ( r 200 ). Graphs show how much mass could be missed at different radii, which can be a few M ( r 200 ) up to the zero‐gravity radius r max . One result is that less‐concentrated halos can be larger and more massive up to r max , relative to M ( r 200 ). These data are useful for applications involving masses of galaxy systems and haloes.