A new scaling relation for HII regions in spiral
unveiling the true nature of the mass-metallicity relation
3D representation of the local surface mass
density ΣLum, gas metallicity 12+log(O/H)
and EW(Hα) relation. The size and color scaling of
the data points are linked to the value of
ΣLum, i.e. low-blue to high-red values.
The projection of the data over any pair of axes reduces
to the local M-Z, M-EW(Hα), and Z-EW(Hα)
Figure adapted from: Rosales-Ortega et al. (2012) ApJL
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