CIEMAT contribution

This project studies in detail galaxies with recent starburts, which implies with massive stars able to ionize the interstellar medium. This photoionization phenomena produces emission lines on the spectra and from their analysis it is possible to deduce the metal abundance of these galaxies.

The CIEMAT participation in this project refers to:

1) To estimate from these emission lines the elemental abundances of the galaxies hosting type Ia supernovae (SN-Ia) to determine if the magnitude of those SNs-Ia has a dependence with the abundance in metals of the host galaxy, what may be important to obtain the errors of the cosmological model parameters.

2) Massive spiral galaxies of the local Universe show abundance negative radial gradients. This feature os related with the infall of gas to form disks. The radial distributions of elements as O,C,N, S or Ne are obtained from the HII region and planetary nebula observations. Combining both type of data it is possible to study the time evolution of these distributions since HII regions give information about the present time abundances while planetary nebula inform to us about the abundance some billions of years ago. We would like use our chemical and spectro-photometric evolutionary models to study the evolution of the abundance radial gradient for galaxies of different masses and types and its relation with the infall of gas in their disks.

3) Analysis of galaxies in 2 dimensions from the observational point of view with data proceeding from spectro-photometric surveys as CALIFA or MEGARA in which we also participate, as from the point of view of the calculation of models in 2D necessary for the correct interpretation of those data. We also participate in the development of new instrumentation to perform better spectroscopical surveys.

4) Other analyses for bulges, barred galaxies, masive stellar clusters.