Deep multiband surface photometry on 45 star forming blue compact galaxies
by
Genoveva Micheva
→
Europe/Stockholm
FA31
FA31
Description
Blue compact galaxies (BCGs) are gas-rich star-forming low redshift
galaxies with low metallicities. In some cases the relative strength of
the starburst can be so high that it completely dominates the light
output of the galaxy, an obstacle which has been countered by deeper
optical imaging data and observations in the near infra-red (NIR)
regime. This has revealed an older population referred to as the “host”.
In an effort to study the hosts of BCGs we have analyzed new and
extremely deep UBVRIHKs imaging data for 45 high and low luminosity
BCGs. We use integrated colors and predictions from new state-of-the-art
spectral evolutionary models to estimate the age and metallicity of the
burst and underlying host populations. Possible evolutionary links to
quiescent galaxies like dEs, dIs, and LSBGs are explored by examining
the structural parameters derived from two radial ranges typically
assumed to be dominated by the underlying host galaxy. We further study
the correlation between minimum asymmetry distribution in the optical
and NIR vs morphological class, concentration and integrated colors to
identify mergers/tidally interacting galaxies. We show that the
dynamical asymmetry component (due to merging/tidal interaction) can be
successfully separated from the flocculent component (due to star
formation) even in cases where the composite asymmetry is completely
flocculent dominated.
