A spatially resolved study of ionized regions in galaxies at different scales

Details A spatially resolved study of ionized regions in galaxies at different scales A spatially resolved study of ionized regions in galaxies at different scales

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phdt........15g&link_type=abstract

PhD Thesis, Universidad Autonoma de Madrid

Computer Science

4

Scientific paper

In this thesis we have studied star formation processes in galaxies at different scales: giant HII regions in spiral discs and individual starburst knots in HII galaxies.
The first has revealed that star formation in these regions is complex and, at least in NGC 5471, has proceeded in a general spatio-temporal sequence from the halo inwards to the core. A remarkable abundance uniformity is found confirming previous results from classical works and validating the use of integrated spectroscopy to obtain abundances in distant objects.
The second has allowed a detailed abundance analysis of several star forming knots in two HII galaxies which shows no conclusive spatial variations of the total abundances. Since there are stellar populations old enough as to have produced supernovae, this implies either a very fast and effective mixing with the surroundings or that the metals whose abundances are inferred proceed from previous star formation events.

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