Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-01-28
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
4 pages, 1 figure, 1 table, to be published in the Proceedings of the IAU Symposium no. 267
Scientific paper
With the development of modern technologies such as IFUs, it is possible to obtain data cubes in which one produces images with spectral resolution. To extract information from them can be quite complex, and hence the development of new methods of data analysis is desirable. We briefly describe a method of analysis of data cubes (data from single field observations, containing two spatial and one spectral dimension) that uses Principal Component Analysis (PCA) to express the data in the form of reduced dimensionality, facilitating efficient information extraction from very large data sets. We applied the method, for illustration purpose, to the central region of the low ionization nuclear emission region (LINER) galaxy NGC 4736, and demonstrate that it has a type 1 active nucleus, not known before. Furthermore, we show that it is displaced from the centre of its stellar bulge.
Menezes Roberto B.
Oliveira Alexandre S.
Ricci Tiago V.
Steiner Joao Evangelista
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