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Astrocladistics: evolutionary classification for galaxies of the M81 group

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Abstract

This work deals with the classification of galaxies based on the evolutionary and hierarchical development of their parameters. We apply the astrocladistic approach to galaxies of the M81 group. Physical parameters such as magnitudes and rotation velocities, among others, were selected and described for 28 galaxies of the M81 group. We carried out a Maximum Parsimony analysis on this dataset with equally weighted characters (parameters), followed by an implied weights analysis. As a result of the first analysis, we obtained 100 equally parsimonious trees, each with 64 evolutionary steps. With the implicit weights analysis we reduced the number of most parsimonious trees to four. We observed the existence of hierarchical organizations with well-defined evolutionary groups, despite the small number of parameters available. According to our results the basal galaxies within the M81 group are objects with spiral structures, low magnitudes and high rotation velocities. The clades containing the derived galaxies are composed mainly of irregular dwarf galaxies with little interstellar material.

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Notes

  1. http://leda.univ-lyon1.fr/

  2. https://www.r-project.org/.

  3. http://en.bio-soft.net/tree/NDE.html.

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Acknowledgements

The authors thank Prof. Dr. Thomas Dumelow for important writing suggestions and the comment of the anonymous reviewers that greatly improved this manuscript.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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All authors contributed to the study conception and design. Material preparation, data collection, analysis and the first draft of the manuscript were performed was written by Maxsuel Marcos Fernandes de Lima and all authors commented and revised previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Maxsuel Marcos Fernandes de Lima.

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de Lima, M.M.F., Porpino, K.d.O. & da Silva, J.R.P. Astrocladistics: evolutionary classification for galaxies of the M81 group. Astrophys Space Sci 368, 29 (2023). https://doi.org/10.1007/s10509-023-04190-6

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  • DOI: https://doi.org/10.1007/s10509-023-04190-6

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