Publication: Discovery of a double ring in the dwarf galaxy Markarian 409
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2003-10-20
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American Astronomical Society
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We report the discovery of a double ring of emission-line regions around the nucleus of the blue compact dwarf galaxy Mrk 409 as seen by deep, ground-based Hα images. Echelle spectroscopy obtained at Magellan I with MIKE shows the presence of ionized gas flowing out of the galaxy from a very massive (≥7 × 10^6 M_☉) nuclear starburst with projected expansion velocities of ~50 km s-^1. 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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© 2003. The American Astronomical Society. All rights reserved. We acknowledge the referee (R. Buta) for his valuable comments. We thank the staff at the Palomar, LCO, Teide, NOT, and CAHA observatories for their help and support. This work has been financed by the Spanish PN de Astronomía y Astrofísica grants AYA2000-1790 and AYA2003-1676, the DFG grants FR325/50-1 and FR325/50-2, the CONACYT (Mexico) grant 36132-E, the EC Marie-Curie grant HPMF-CT-2000- 00774, and the NASA Galaxy Evolution Explorer mission.
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