Improved data reduction procedure for the mid-infrared slit spectroscopy of AKARI/IRC LG2

In this presentation, we report on our technical efforts to evaluate and mitigate artifacts that have hindered accurate spectral extraction in AKARI Infrared Camera (IRC) LG2 slit spectroscopy. The AKARI/IRC LG2 slit spectroscopic data suffer from artifacts such as contamination by zeroth- and second-order light in the edge regions of the aperture mask, as well as scattered light produced by the incident beam within the field of view. To establish a standardized procedure for deriving reliable LG2 slit spectra, we investigate the efficiencies of the zeroth-, first-, and second-order light, the slit properties, the geometry of the aperture mask, and the characteristics of the scattered light. Through these analyses, we develop a robust data-reduction method that eliminates previously uncorrected artifacts and enables accurate extraction of LG2 slit spectra, particularly for diffuse sources.