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Date and Time of the Query: 2019-04-19 T08:44:07 PDT
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For refcode 2007ApJ...669..299P:
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Copyright by American Astronomical Society. Reproduced by permission
2007ApJ...669..299P The Oxygen Abundance of Nearby Galaxies from Sloan Digital Sky Survey Spectra Leonid S. Pilyugin and Trinh X. Thuan Abstract. We have derived the oxygen abundance for a sample of nearby galaxies in Data Release 5 of the Sloan Digital Sky Survey (SDSS) that possess at least two independent spectra of one or several H II regions with a detected [O III] {lambda}4363 auroral line. Since, for nearby galaxies, the [O II] {lambda}3727 nebular line is out of the observed wavelength range, we propose a method to derive (O/H)_ff_ abundances using the classic T_e_ method coupled with the flux-flux (ff) relation. (O/H)_7325_ abundances have also been determined, based on the [O II] {lambda}{lambda}7320, 7330 line intensities and using a small modification of the standard T_e_ method. The (O/H)_ff_ and (O/H)_7325_ abundances have been derived with both the one- and two-dimensional t_2_-t_3_ relations. It was found that the (O/H)_ff_ abundances derived with the parametric two-dimensional t_2_-t_3_ relation are the most reliable. Oxygen abundances have been determined in 29 nearby galaxies on the basis of 84 individual abundance determinations in H II regions. Because of our selection methods, the metallicity of our galaxies lies in the narrow range 8.2<~12+ log (O/H)<~8.4. The radial distribution of oxygen abundances in the disk of the spiral galaxy NGC 4490 is determined for the first time. Key words: Galaxies: Abundances, ISM: H II Regions, ISM: Abundances
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