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The quasar population density as a result of the formation rate and the evolutionary pathes II. Adaption to the observation
Author(s) -
Boller T.,
Liebscher D.E.,
Lorenz H.
Publication year - 1990
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.2113110507
Subject(s) - quasar , luminosity , astrophysics , physics , function (biology) , population , luminosity function , biology , evolutionary biology , demography , sociology , galaxy
The continuity equation of C AVALIERE et al. (1971) generalized to age‐dependent luminosity evolution (B OLLER and L IEBSCHER 1989) is used to calculate quasar luminosity functions. For some combinations of source functions S(L, t) and evolutionary pathes M(L) we discuss the resulting N — m relations and the amount of the X‐ray background and compare them with actual results of observation. We can exclude certain models, (S(L, t), M(L)) . We cannot yet decide what the actual source function and the actual evolutionary path are.