Full-Fledged Dwarf Irregular Galaxy Leo A

Details Full-Fledged Dwarf Irregular Galaxy Leo A Full-Fledged Dwarf Irregular Galaxy Leo A

2004-05-17

arxiv.org/abs/astro-ph/0405313v1

Astrophys.J.611:L93-L96,2004

Astronomy and Astrophysics

Astrophysics

9 pages, 3 figures, submitted to ApJL

Scientific paper

10.1086/423802

We have studied Leo A - the isolated and extremely gas rich dwarf irregular galaxy of very low stellar mass and metallicity. Ages of the stellar populations in Leo A are ranging from ~10 Myr to ~10 Gyr. Here we report the discovery of an old stellar halo and a sharp stellar edge. Also we find the distribution of stars extending beyond the gaseous envelope of the galaxy. Therefore, Leo A by its structure as well as stellar and gaseous content is found to resemble massive disk galaxies. This implies that galaxies of very low stellar mass are also able to develop complex structures, challenging contemporary understanding of galaxy evolution.

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