期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 415, 期 3, 页码 2417-2425出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.18869.x
关键词
methods: data analysis; methods: statistical; galaxies: fundamental parameters
资金
- Spanish Ministry of Science, Technology and Innovation [AYA 2007-67965-C03-03, AYA 2007-67965-C03-01, AYA 2007-67752-C03-01, CSD 2006-00070]
We identify a spectroscopic sequence of galaxies, analogous to the Hubble sequence of morphological types, based on the Automatic Spectroscopic K-means-based (ASK) classification. Considering galaxy spectra as multidimensional vectors, the majority of the spectral classes are distributed along a well-defined curve going from the earliest to the latest types, suggesting that the optical spectra of normal galaxies can be described in terms of a single affine parameter. Optically bright active galaxies, however, appear as an independent, roughly orthogonal branch that intersects the main sequence exactly at the transition between early and late types.
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