Progress Report

Today, I have finished the chapter called “Diversification” which is fundamental to Astrocladistics since it explains why such a phylogenetic tool can be applied to galaxies (and beyond). With already completed chapters “Classification” and “Cladistics”, I have given all the concepts necessary to understand what is behind Astrocladistics.

The next step is to go into the application itself with the Chapter “Astrocladistics in practice”, and then, give some hint on how to read a tree. At this point, I hope, many astronomer colleagues will be able to try by themselves.

I would like to be more active on the blog, this is why I have put the posts on the welcome page of this site.

For instance, I must mention our last paper :

A six-parameter space to describe galaxy diversification. Fraix-Burnet, D., Chattopadhyay, T., Chattopadhyay, A.K., Davoust, E., Thuillard M. 2012, A&A 545, A80 Astronomy & Astrophysics  (

for which I will possibly devote a post because it is a new step forward in astrocladistics:

  1. we use four statistical methods in parallel: PCA, k-means, Minimum Contradiction Analysis, and cladistics,
  2. we search for the most discriminant parameters before doing the clustering,
  3. we combine two of our results to sketch the first general classification tree of galaxies using transformation events to explain nodes and leaves.
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