Relations between stellar mass and electron temperature-based metallicity for star-forming galaxies in a wide mass range

TitleRelations between stellar mass and electron temperature-based metallicity for star-forming galaxies in a wide mass range
Publication TypeJournal Article
Year of Publication2014
AuthorsShi, W-B, Liang, Y-C, Shao, X, Liu, X-W, Zhao, G, Hammer, F, Zhang, Y, Flores, H, Ruan, G-P, Zhou, L
JournalResearch in Astronomy and Astrophysics
Volume14
Pagination875-890
Abstract

{We select 947 star-forming galaxies from SDSS-DR7 with [O III]{$łambda$}4363 emission lines detected at a signal-to-noise ratio larger than 5{$\sigma$}. Their electron temperatures and direct oxygen abundances are then determined. We compare the results from different methods. t₂, the electron temperature in the low ionization region, estimated from t₃, that in the high ionization region, is compared using three analysis relations between t₂ - t₃. These show obvious differences, which result in some different ionic oxygen abundances. The results of t₃, t₂, O$^{++}$/H$^{+}$ and O$^{+}$/H$^{+}$ derived by using methods from IRAF and literature are also compared. The ionic abundances O$^{++}$/H$^{+}$ are higher than O$^{+}$/H$^{+}$ for most cases. The different oxygen abundances derived from T$_{e}$ and the strong-line ratios show a clear discrepancy, which is more obvious following increasing stellar mass and strong-line ratio R$_{23}$. The sample of galaxies from SDSS with detected [O III]{$łambda$}4363 have lower metallicites and higher star formation rates, so they may not be typical representatives of the whole population of galaxies. Adopting data objects from Andrews {\amp} Martini, Liang et al. and Lee et al. data, we derive new relations of stellar mass and metallicity for star-forming galaxies in a much wider stellar mass range: from 10⁶ M$_{solar}$ to 10$^{11}$ M$_{solar}$. }

DOI10.1088/1674-4527/14/7/010
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