Recent Star Formation in Groups of Galaxies: HCG 31

摘要

Broadband UBVRI and narrowband Hα and continuum images have been obtained for the Hickson compact group HCG 31 as part of an ongoing program devoted to the study of the star formation properties of galaxies in these groups. A spatially resolved analysis for the (U-B), (V-I), and (B-I) color maps has been performed, as well as for the U band, Hα luminosity, and Hα equivalent width maps. Integrated luminosities in all the bands have been derived for all the galaxies in the group. Our results show that all the galaxies appear to have experienced their most recent star formation episode less than 10~7 years ago, in good agreement with previous values found in the literature.