Biased theories of galaxy formation with arbitrary threshold functions and background distribution

The technical aspects of considering non-theta thresholds within the framework of biased theories of galaxy formation are discussed, without restricting the treatment to background Gaussian matter distribution. First, non-Gaussian backgrounds and non-theta thresholds are simultaneously considered. T...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:The Astrophysical journal 1990, Vol.348 (2), p.398-411
Hauptverfasser: BORGANI, S, BONOMETTO, S. A
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The technical aspects of considering non-theta thresholds within the framework of biased theories of galaxy formation are discussed, without restricting the treatment to background Gaussian matter distribution. First, non-Gaussian backgrounds and non-theta thresholds are simultaneously considered. Then a number of other features are accounted for through suitable forms of threshold functions. Two specific examples of non-theta thresholds relate directly to the effects of nonspherical gravitational growing and a possible merging of fluctuations on different mass scales during the growing stages. It appears that these effects become stronger for mass scales corresponding to Abell cluster mass scale range. In particular, the threshold related to nonsphericity makes the observed number densities of Turner and Gott groups and Abell cluster naturally coherent. 49 refs.
ISSN:0004-637X
1538-4357
DOI:10.1086/168249