NDLI: Astrocladistics: A Phylogenetic Analysis of Galaxy Evolution II. Formation and Diversification of Galaxies

Content Provider	Springer Nature Link
Author	Fraix Burnet, Didier Choler, Philippe Douzery, Emmanuel J.P. Verhamme, Anne
Copyright Year	2006
Abstract	This series of papers is intended to evaluate astrocladistics in reconstructing phylogenies of galaxies. The objective of this second paper is to formalize the concept of galaxy formation and to identify the processes of diversification. We show that galaxy diversity can be expected to organize itself in a hierarchy. In order to better understand the role of mergers, we have selected a sample of 43 galaxies from the GALICS database built from simulations with a hybrid model for galaxy formation studies. These simulated galaxies, described by 119 characters and considered as representing still undefined classes, have experienced different numbers of merger events during evolution. Our cladistic analysis yields a robust tree that proves the existence of a hierarchy. Mergers, like interactions (not taken into account in the GALICS simulations), are probably a strong driver for galaxy diversification. Our result shows that mergers participate in a branching type of evolution, but do not seem to play the role of an evolutionary clock.
Starting Page	57
Ending Page	78
Page Count	22
File Format	PDF
ISSN	01764268
Journal	Journal of Classification
Volume Number	23
Issue Number	1
e-ISSN	14321343
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pattern Recognition Bioinformatics Statistical Theory and Methods Signal, Image and Speech Processing Psychometrics Marketing
Content Type	Text
Resource Type	Article
Subject	Mathematics Psychology Library and Information Sciences Statistics, Probability and Uncertainty

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Astrocladistics: A Phylogenetic Analysis of Galaxy Evolution I. Character Evolutions and Galaxy Histories

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K-modes Clustering

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Astrocladistics: A Phylogenetic Analysis of Galaxy Evolution II. Formation and Diversification of Galaxies

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