Discovery of a double ring in the dwarf galaxy Mrk409

Details Discovery of a double ring in the dwarf galaxy Mrk409 Discovery of a double ring in the dwarf galaxy Mrk409

2003-09-05

arxiv.org/abs/astro-ph/0309190v1

Astrophys.J.596:L179-L182,2003

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures, accepted for publication in ApJL

Scientific paper

10.1086/379601

We report the discovery of a double ring of emission-line regions around the nucleus of the Blue Compact Dwarf (BCD) galaxy Mrk409 as seen by deep, ground-based Halpha images. Echelle spectroscopy obtained at Magellan-I with MIKE shows the presence of ionized gas flowing out of the galaxy from a very massive (>7E6 Msun) nuclear starburst with projected expansion velocities of \~50 km/s. Different scenarios for the formation of these rings are discussed. While the innermost, nuclear ring is most probably formed by the interaction of a starburst-driven shock with the surrounding interstellar medium, the origin of the outer ring is less clear.

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