Star clusters and young populations in the dwarf irregular galaxy Leo A
| Autor: | Vladas Vansevičius, Marius Čeponis, R. Stonkutė, Alina Leščinskaitė |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Star formation Metallicity FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Astrophysics - Astrophysics of Galaxies Galaxy Stars Leo A Star cluster Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Supergiant Irregular galaxy 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.1810.07472 |
| Popis: | We have studied young stellar populations and star clusters in the dwarf irregular galaxy Leo A using multicolor ($B$, $V$, $R$, $I$, $H\alpha$) 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 $\sim$200 Myr. Also, we have discovered 5 low-mass ($\lesssim$400 M$_\odot$) 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 $H\alpha$), implying an unseen progenitor and reminding the "hole" problems widely discussed by Warren et al. (2011). Comment: 4 pages, 3 figures, Poster contribution, IAU Symposium 344, Dwarf Galaxies: from the Deep Universe to the Present, (Eds) S. Stierwalt & K. McQuinn |
| Databáze: | OpenAIRE |
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