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• W2045531469 endingPage "144" @default.
• W2045531469 startingPage "144" @default.
• W2045531469 abstract "We have derived the star formation history (SFH) of the blue compact dwarf galaxy IZw18 through comparison of deep HST/ACS data with synthetic color magnitude diagrams. A statistical analysis was implemented for the identification of the best-fit SFH and relative uncertainties. We confirm that IZw18 is not a truly young galaxy, having started forming stars earlier than ~1 Gyr ago, and possibly at epochs as old as a Hubble time. In IZw18's main body we infer a lower limit of ~2 x 10^{6} M_sun for the mass locked-up in old stars. IZw18' s main body has been forming stars very actively during the last ~10 Myr, with an average star formation rate (SFR) as high as ~1 M_sun/yr (or ~2 x 10^{-5} M_sun yr^{-1} pc^{-2}). On the other hand, the secondary body was much less active at these epochs, in agreement with the absence of significant nebular emission. The high current SFR can explain the very blue colors and the high ionized gas content in IZw18, resembling primeval galaxies in the early Universe. Detailed chemical evolution models are required to quantitatively check whether the SFH from the synthetic CMDs can explain the low measured element abundances, or if galactic winds with loss of metals are needed." @default.
• W2045531469 created "2016-06-24" @default.
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• W2045531469 date "2013-10-28" @default.
• W2045531469 modified "2023-10-16" @default.
• W2045531469 title "THE STAR FORMATION HISTORY OF THE VERY METAL-POOR BLUE COMPACT DWARF I Zw 18 FROM<i>HST</i>/ACS DATA" @default.
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• W2045531469 doi "https://doi.org/10.1088/0004-6256/146/6/144" @default.
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