Star clusters and young populations in the dwarf irregular galaxy Leo A
Abstract
We have studied young stellar populations and star clusters in the dwarf irregular galaxy Leo A using multicolor (B, V, R, I, Hα) photometry data obtained with the Subaru Suprime-Cam and two-color photometry results measured on archival HST/ACS F475W and F814W frames. The analysis of the main sequence (MS) and blue supergiant (BSG - "blue loop") stars enabled us to study the star formation history in the Leo A galaxy during the last 200 Myr. Also, we have discovered 5 low-mass (400 M) star clusters within the ACS field. This finding, taking into account a low metallicity environment and a yet-undetected molecular gas in Leo A, constrains star formation efficiency estimates and scenarios. Inside the well known "hole" in the HI column density map (Hunter et al. 2012) we found a shock front (prominent in Hα), implying an unseen progenitor and reminding the "hole" problems widely discussed by Warren et al. (2011).
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