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Fig. 2

image

Optical (left) and NIR (right) spectra of WISE J0720. The low-resolution optical spectrum is plotted in black, the medium-resolution in red. The reddest part of the NIR spectrum, affected by a wavelength calibration problem (see Sect. 2.2 for details) is shown in gray. The gap at ~11 000 Å is an omitted cosmic ray hit. The insets on the left zoom in on the regions around the Hα and the Li I features, and the dotted vertical lines show their rest-frame positions. The mismatch between the fluxes of the three spectra are probably due to unaccounted for slit losses.

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