Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-21
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures. From the Congference "First Light Science with the Gran Telescopio Canarias" (2006). To appear in RevMexAA
Scientific paper
Based on O II recombination lines we present a new calibration (called O II[RL]) of Pagel's O23 indicator to determine the O/H abundance ratio in extragalactic H II regions and emission line galaxies. The O II(RL) calibration produces O/H abundances about a factor of two higher than those derived from the T(4363) method with t2 = 0.00. The O II(RL) calibration has implications for the study of different properties of emission line galaxies such as their metallicity, star formation rate, and initial mass function. The O II(RL) calibration also affects the abundance determinations based on other O/H indicators, that include collisionally excited lines, like those known as O3N2, N2, S23, Ar3O3, and S3O3. We argue that the controversy between the T(4363) method and the photoionization models method to derive O/H values is mainly due to temperature variations inside the observed H II regions.
Bresolin Fabio
Carigi Leticia
Esteban Cesar
García-Rojas Jorge
Lopez-Sanchez Angel R.
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