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Heavy Elements Unveil the Non-primordial Origin of the Giant H I Ring in Leo

  • Authors: Edvige Corbelli, Giovanni Cresci, Filippo Mannucci, David Thilker, and Giacomo Venturi

2021 The Astrophysical Journal Letters 908 L39.

  • Provider: AAS Journals

Caption: Figure 2.

Dust visual extinction and gas-phase metallicity for each H II region, color-coded as in the legend. In the top panel we show the best-fitting values (cross) and 1σ confidence levels of AV; the dotted line shows the solar metallicity (12 + log(O/H) = 8.69). The four bottom panels refer to relevant strong line ratios. Diamonds show the observed values of the line ratio plotted at the best-fitting value of metallicity. The Hα/Hβ ratio is computed for Case B recombination with uncertainties due to the unknown temperature, and circles showing extinction-corrected values. The solid curves in the lower three panels trace the calibrations from Curti et al. (2020), with the relative uncertainties.

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