Properties of the HII Regions Derived Using Integral Field Spectroscopy
Figure 4
(a) [OIII]5007/H versus [NII]6583/H diagnostic diagram for the ~7000 ionized regions shown in Figure 3(a). The color solid-lines represent the expected line ratios derived from the MAPPINGS-III ionization models, based on an instantaneous zero-age starbust model based on the PEGASE spectral energy distribution. Each solid-line corresponds to a different metallicity, which is indicated with the corresponding label in units of solar abundance, with a different ionization strength that varies from strong to weak ionizations from left to right in each line. (b) Identical diagram to that in (a), with the only difference that in this particular case the color solid-lines represents the expected line ratios for a continuous starburst model after 4 Myr of its ignition. In ((a), (b)), the dot-dashed and dashed-line represent, respectively, the Kauffmann et al. [26] and Kewley et al. [27] demarcation curves. They are usually invoked to distinguish between classical star-forming objects (below the solid line) and AGN powered sources (above the dashed line). Regions between both lines are considered intermediate ones.
