Bibcode
Gil de Paz, A.; Madore, B. F.; Zamorano, J.; Gallego, J.; Sanchez Contreras, C.; Silich, S.
Referencia bibliográfica
American Astronomical Society, 198th AAS Meeting, #09.10; Bulletin of the American Astronomical Society, Vol. 33, p.800
Fecha de publicación:
5
2001
Número de citas
0
Número de citas referidas
0
Descripción
In this poster we present the results from the multi-wavelength study of
the dynamical and photometric evolution of the Blue Compact Dwarf galaxy
Mrk 86. We have obtained BVRJHK, Hα , and [Oiii]λ 5007
Å imaging, long-slit optical spectroscopy, and Hα
Fabry-Perot interferometry for this galaxy. These observations will be
complemented in a near future with a map of the molecular gas
distribution in the 12CO(1--0) and (2--1) transitions using
the 30m Pico de Veleta millimeter telescope. The analysis of the optical
and near-infrared images and optical spectra have revealed the presence
of, at least, three different stellar populations. A
low-surface-brightness underlying population with an age between 5 and
13 Gyr, a massive 30 Myr old central starburst with a stellar mass of
about 107 Msun, and a total of 46 low-metallicity
young star-forming regions. The comparison of our Fabry-Perot Hα
velocity field with the galaxy mass-density profile indicates that the
current star-formation activity is located in a ring with 800 pc of
radius inclined ~40o. This fact, along with the age
difference between the central starburst and these young star-forming
regions, suggest that the evolution of the massive central starburst
could be related with the activation of the most recent star-formation
activity. In this sense, hydrodynamical simulations for the evolution of
starbursts in dwarf galaxies predict the formation of an expanding shell
of swept out interstellar material that, in some cases, could shape a
toroid of dense (>60 Msun pc-2) gas at
distances of about 1 kpc. This scenario, that could explain both the
spatial and age distribution of the recent star-formation activity in
Mrk 86, will be definitively confirmed (or ruled out) by our future
12CO observations.