Astronomy and Astrophysics, volume 361, 465-479 (2000/9-2)
Mapping the star formation history of Mrk 86. II. Stellar populations and global interpretation.
GIL DE PAZ A., ZAMORANO J. and GALLEGO J.
Abstract (from CDS):
In this paper, continuation of Gil de Paz et al. (Paper I, 2000A&AS..145..377G
), we derive the main properties of the stellar populations in the Blue Compact Dwarf galaxy Mrk 86
. Ages, stellar masses, metallicites and burst strengths have been obtained using the combination of Monte Carlo simulations, a maximum likelihood estimator and Cluster and Principal Component Analysis. The three stellar populations detected show well defined properties. We have studied the underlying stellar population, which shows an age between 5-13Gyr and no significant color gradients. The intermediate aged (30Myr old) central starburst show a very low dust extinction with high burst strength and high stellar mass content (∼9x106
). Finally, the properties of 46 low-metallicity (∼1/10Z☉
) star-forming regions were also studied. The properties derived suggest that the most recent star-forming activity in Mrk 86
was triggered by the evolution of a superbubble originated at the central starburst by the energy deposition of stellar winds and supernova explosions. This superbubble produced the blowout of a fraction of the interstellar medium at distances of about 1kpc with high gas surface densities, leading to the activation of the star formation. Finally, different mechanisms for the star formation triggering in this massive central starburst are studied, including the merging with a low mass companion and the interaction with UGC 4278
. We have assumed a distance to Mrk 86
galaxies: individual: Mrk 86 - galaxies: irregular - galaxies: star clusters - galaxies: stellar content
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