How to determine the star formation histories in spiral disks

Details How to determine the star formation histories in spiral disks How to determine the star formation histories in spiral disks

2003-02-05

arxiv.org/abs/astro-ph/0302086v1

Astronomy and Astrophysics

Astrophysics

Proceedings of the V Scientific Meeting of the Spanish Astronomical Society (Toledo, Spain, 2002)

Scientific paper

We have computed 500 chemical evolution models for the galaxy NGC 4303. With the obtained evolutionary histories and a synthesis model we have also calculated the spectral indices Mg2 and Fe5270. Fom the 500 models, by using a chi-square technique, we obtain those reproducing the present day observations within a confidence level of 95 %, reducing the number of possible models to 19. Only 6 of them are also able to reproduce the spectral indices radial distributions with the same level of confidence. We conclude that this technique of combining chemical with evolutionary synthesis models is a very powerful tool, and, therefore, we propose to perform more observational campaigns to obtain these and other spectral indices in spiral and irregular galaxies.

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