8-12 juin, 2014


Nearby Isolated Dwarfs as Probes of Galaxy Evolution

Clare Higgs (University of Victoria)

Alan McConnachie, NRC Herzberg

Resolved stellar populations of nearby galaxies allow for detailed analysis of characteristics and structures that are generally excluded by resolution limits for the vast majority of more distant galaxies. This limitation is particularly true for dwarf galaxies due to their intrinsically low luminosities and small sizes. However, these dwarf systems are of particular interest as they are sensitive probes of galaxy evolution. Various parameters, such as morphology and star formation rate, have a complex and poorly understood dependence on internal processes, like supernova feedback, and external factors, like tidal stripping. Resolved dwarf galaxies are presently dominated by the well-studied satellite dwarfs associated with the Local Group. We present preliminary work based on new CFHT and Magellan observations aiming to constructing a cohesive data set of all nearby isolated dwarf galaxies. The primary focus will be global properties, such as stellar content and their extended low surface brightness structure. This volume limited sample is an ideal comparison for satellite dwarfs, and can be used to better constrain the effects of a host on galactic evolution. Here, I present an overview of the sample, and discuss first results for the Sagittarius Dwarf Irregular Galaxy (Sag DIG), including a new distance estimate, isochrone analysis of stellar populations, and 2D maps of its extended low surface brightness structure.

Mode de présentation: Affiche