Relations of stellar mass and electron temperature-based metallicity of star-forming galaxies in wide mass range

We gather a sample of both metal-rich and low metallicity galaxies. Both of them have oxygen abundances estimated from electron temperature (Te). They spread in a wide stellar mass range from 10⁶ M _⊙ to 10¹¹ M _⊙. Then, a consistent relation of stellar mass and metallicity are derived from them for such wide range of stellar masses. This relation also shows clearly the discrepancy of Te-based oxygen abundances from those derived from the strong-line method.