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With SDSS and WISE data, we study the mid-IR properties of a large sample of local Seyfert 2 galaxies. We find the host-subtracted mid-IR luminosities are linearly correlated with [OIII] luminosities for three orders of magnitude. The partition functions of the total integrated [OIII] and mid-IR luminosities from AGNs, as a function of a variety of host galaxy properties, are identical, consistent with the expectation of simple AGN unified model. However, the mid-IR emission is correlated with excessive number of neighbouring galaxies within a projected distance of 100 kpc, while [OIII] emission is not. It implies a phase of torus formation during galaxy interactions. |
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