An observational study of the physical and stellar properties of a sample of Hoag-type galaxies

Abstract

Interactions between galaxies can trigger a wide range of physical and morphological phenomena, such as long tidal tails of stars and gas bridges and rings. Galaxies with ring appearance, called ring galaxies are ideal objects for studying the formation and non-nuclear stellar evolution, as well as the physical mechanisms of accretion/ interaction, the formation of the disk and the shape of the dark halo. A special class of ring galaxies, the Hoag type has a peculiar morphology, with almost spherical bulges and relatively large surrounding a perfect core at its center. They are extremely rare objects, Whose physical properties were determined for a few objects and whose formation mechanism in Hoag-type objects is still controversial. In this project entitled "An observational study on the physical and stellar properties of a sample of Hoag-type galaxies", we propose to perform a study for a sample of Hoag-type galaxies selected from Category 2 (ringed galaxies) and 10 ( peculiar galaxies with spiral arms) Arp & Madore catalog (1987). For thisspectrophotometry and photometry data will be used, combined with models of stellar population synthesis and photoionization models. (AU)