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Fig. 1

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Left: false-color image of the NGC 7023 nebula such as the one presented in Sellgren et al. (2010), obtained from integrating different components in the Spitzer-IRS LL spectral cube. Red is the emission integrated in the C60 19 μm band. Green is the emission of the PAH 16.4 μm band. Blue is the emission integrated in the H2 (0-0) S(0) 17.0 μm band. The white rectangles indicate the regions where the IRS-SL spectra shown in the right panel have been extracted. The black dashed rectangle depicts the IRS-SL field of view. The white dashed rectangle shows the region where Sellgren et al. (2010) extracted their spectrum. Right: spectra at positions 1 and 2 in the image. The spectrum at position 1 has been shifted up and scaled down to allow easier comparison to the spectrum at position 2. Error bars are not shown here but are comparable to the width of the line (see Fig. 2). The red lines indicate the four newly detected bands attributed to C. The DFT calculated spectrum (with scaled wavelength positions) is shown as a bar graph in blue.

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