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Fig. 10.

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Emission-line ratio maps for the extended gas around PDS 456. Top panel: [N II]/Hα emission line ratio map, at S/NHα > 2.5, whose pixel size is five times larger than the native pixel in NFM MUSE data, which corresponds to ∼1.3 FWHMPSF. The black dot gives the position of the central quasar, and has the FWHM size of the PSFNFM. Bottom panel: Map of the [O III]/Hβ line ratio estimated through the [O III] and Hβ optimally extracted NB images extracted from the WFM MUSE data with CubExtractor. The black contours represent the S/N levels of the Hα emission extracted from the NFM MUSE data at 3, 5, and 10.

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