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- W3100217409 abstract "We have investigated the oxygen and nitrogen chemical abundances in extremely compact star-forming galaxies with redshifts between $sim$0.11-0.35, popularly referred to as green peas. Direct and strong-line methods sensitive to the N/O ratio applied to their SDSS spectra reveals that these systems are genuine metal-poor galaxies, with mean oxygen abundances 20% solar. At a given metallicity these galaxies display systematically large N/O ratios compared to normal galaxies, which can explain the strong difference between our metallicities measurements and previous ones. While their N/O ratios follow the relation with stellar mass of local star-forming galaxies in the SDSS, we find that the mass--metallicity relation of the green peas is offset $ga$0.3 dex to lower metallicities. We argue that recent interaction-induced inflow of gas, possibly coupled with a selective metal-rich gas loss, driven by supernova winds, may explain our findings and the known galaxy properties, namely high specific star formation rates, extreme compactness, and disturbed optical morphologies. The green pea galaxy properties seem to be not common in the nearby Universe, suggesting a short and extreme stage of their evolution. Therefore, these galaxies may allow us to study in great detail many processes, such as starburst activity and chemical enrichment, under physical conditions approaching those in galaxies at higher redshifts." @default.
- W3100217409 created "2020-11-23" @default.
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- W3100217409 date "2010-05-10" @default.
- W3100217409 modified "2023-10-09" @default.
- W3100217409 title "ON THE OXYGEN AND NITROGEN CHEMICAL ABUNDANCES AND THE EVOLUTION OF THE “GREEN PEA” GALAXIES" @default.
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- W3100217409 doi "https://doi.org/10.1088/2041-8205/715/2/l128" @default.
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