The Distribution of Galaxies in Spectral Space

Bibcode
2012adm..book...63A
DOI
10.1007/978-1-4614-3323-1_5
Ascasibar, Y.; Almeida, J. Sánchez
Bibliographical reference

Astrostatistics and Data Mining, Springer Series in Astrostatistics, Volume 2. ISBN 978-1-4614-3322-4. Springer Science+Business Media New York, 2012, p. 63

Advertised on:
0
2012
Number of authors
2
IAC number of authors
1
Citations
0
Refereed citations
0
Description
Considering Galaxy spectra as multidimensional vectors, we use the k-means algorithm and the minimum spanning tree to show that the data in the Sloan Digital Sky Survey do not fill the entire space but are confined to a manifold with very low dimensionality. More precisely, all the spectra can be described in terms of only two degrees of freedom: one discrete parameter labelling the Galaxy as "normal" or "active," and one continuous affine parameter describing its position along the corresponding sequence.
Type
Non-refereed

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