| Stellar Population Analysis of Galaxies based on Genetic Algorithms |
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| 作者姓名： | Abdel-Fattah Attia H. A. Ismail I. M. Selim A. M. Osman I. A. Isaa M. A. Marie A. A. Shaker |
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| 作者单位： | [1]National Research Institute of Astronomy and Geophysics （NRIAG）, 11421 Helwan, Cairo,Egypt [2]Cairo University, Faculty of Science, Astronomy Department, Egypt |
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| 摘 要： | We present a new method for determining the age and relative contribution of different stellar populations in galaxies based on the genetic algorithm. We apply this method to the barred spiral galaxy NGC 3384, using CCD images in U, B, V, R and I bands. This analysis indicates that the galaxy NGC 3384 is mainly inhabited by old stellar population (age >109yr). Some problems were encountered when numerical simulations are used for determining the contribution of different stellar populations in the integrated color of a galaxy. The results show that the proposed genetic algorithm can search efficiently through the very large space of the possible ages.
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| 关 键 词： | 恒星 星系 起源 空间分布 |
Stellar Population Analysis of Galaxies based on Genetic Algorithms |
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| Abdel-Fattah Attia,H. A. Ismail,I. M. Selim,A. M. Osman,I. A. Isaa,M. A. Marie,A. A. Shaker.Stellar Population Analysis of Galaxies based on Genetic Algorithms[J].Chinese Journal of Astronomy and Astrophysics,2005,5(4):347-355. |
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| Authors: | Abdel-Fattah Attia H A Ismail I M Selim A M Osman I A Isaa M A Marie A A Shaker |
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| Abstract: | We present a new method for determining the age and relative contribution of different stellar populations in galaxies based on the genetic algorithm. We apply this method to the barred spiral galaxy NGC 3384, using CCD images in U, B, V, R and I bands. This analysis indicates that the galaxy NGC 3384 is mainly inhabited by old stellar population (age >109yr). Some problems were encountered when numerical simulations are used for determining the contribution of different stellar populations in the integrated color of a galaxy. The results show that the proposed genetic algorithm can search efficiently through the very large space of the possible ages. |
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| Keywords: | methods: numerical - galaxies: stellar population - galaxies: individual (NGC 3384) |
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