Mid-IR rest-frame spectrum of IC 3639. In red we plot the VLT/VISIR spectrum acquired with a slit size of 0.′′ 75 ×0.′′52 and a spectral resolution of R ~ 350. In light green we show the Spitzer/IRS spectrum at R ~ 600 obtained from the full-aperture extraction (slit size of 4.′′ 7 × 11.′′3). In dark green we show the “optimal differential” extracted spectrum of the same observation (see text). Both IRS spectra were taken from the CASSIS atlas (Lebouteiller et al. 2015). Black circles correspond to VLT/VISIR photometric measurements at ~ 0.′′ 5 resolution (96 pc). The average correlated flux estimated from VLTI/MIDI (~ 90 mJy) is represented by the blue square. Black open triangles correspond to synthetic photometry performed on the VISIR spectrum. Note that no scaling has been applied to the Spitzer/IRS-SH spectrum, thus the match between the continuum level in both spectra suggests that the point-like source seen by VISIR also dominates the Spitzer/IRS-SH spectrum. Emission lines stand out in the IRS spectrum because of the higher spectral resolution.
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