Discovery of a double ring in the dwarf galaxy Mrk409
Astrophysics
2009-11-10 v1
Abstract
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.
Cite
@article{arxiv.astro-ph/0309190,
title = {Discovery of a double ring in the dwarf galaxy Mrk409},
author = {A. Gil de Paz and B. F. Madore and K. Noeske and L. M. Cairos and P. Papaderos and S. A. Silich},
journal= {arXiv preprint arXiv:astro-ph/0309190},
year = {2009}
}
Comments
8 pages, 2 figures, accepted for publication in ApJL