 |
Observatoire Midi-Pyrénées |  |
|
Observatoire Midi-Pyrénées | |
| HAL: hal-00708735, version 2 |
| arXiv: 1206.3690 |
| DOI: 10.1051/0004-6361/201218769 |
| Detailed view |  Export this paper |
 |
| Astronomy and Astrophysics 545 (2012) A80 |
|
|
| Available versions: | v1 (2012-06-16) | v2 (2012-07-04) |
|
|
|
|
| A six-parameter space to describe galaxy diversification |
|
|
| Didier Fraix-Burnet 1Tanuka Chattopadhyay 2 |
|
|
| (2012) |
|
|
|
| Galaxy diversification proceeds by transforming events like accretion, interaction or mergers. These explain the formation and evolution of galaxies that can now be described with many observables. Multivariate analyses are the obvious tools to tackle the datasets and understand the differences between different kinds of objects. However, depending on the method used, redundancies, incompatibilities or subjective choices of the parameters can void the usefulness of such analyses. The behaviour of the available parameters should be analysed before an objective reduction of dimensionality and subsequent clustering analyses can be undertaken, especially in an evolutionary context. We study a sample of 424 early-type galaxies described by 25 parameters, ten of which are Lick indices, to identify the most structuring parameters and determine an evolutionary classification of these objects. Four independent statistical methods are used to investigate the discriminant properties of the observables and the partitioning of the 424 galaxies: Principal Component Analysis, K-means cluster analysis, Minimum Contradiction Analysis and Cladistics. (abridged) |
|
|
|
|
|
|
|
|
|
|
|
| 1: | Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) |
|
|
|
CNRS : UMR5274 – INSU – Université Joseph Fourier - Grenoble I – OSUG |
|
|
| 2: | Department of Applied Mathematics |
|
|
|
Calcutta University |
|
|
| 3: | Department of Statistics |
|
|
|
Calcutta University |
|
|
| 4: | Institut de recherche en astrophysique et planétologie (IRAP) |
|
|
|
CNRS : UMR5277 – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées |
|
|
| 5: | La Colline |
|
|
|
Aucune |
|
|
|
|
|
|
|
|
|
| Subject | : | Sciences of the Universe/Astrophysics/Cosmology and Extra-Galactic Astrophysics Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics Sciences of the Universe/Astrophysics/Instrumentation and Methods for Astrophysic Physics/Astrophysics/Instrumentation and Methods for Astrophysic |
|
|
| Attached file list to this document: | ||||||||||
|
||||||||||
|
|
|
| hal-00708735, version 2 | |
| http://hal.archives-ouvertes.fr/hal-00708735 | |
| oai:hal.archives-ouvertes.fr:hal-00708735 | |
| From: Didier Fraix-Burnet | |
| Submitted on: Wednesday, 4 July 2012 09:35:16 | |
| Updated on: Wednesday, 12 September 2012 11:51:53 | |
