AKARI mid-infrared slit-less spectroscopic catalogue

Abstract

AKARI/IRC has a capability of the slit-less spectroscopy in the mid-infrared (5--13 $\mu$m) over a 10 arcmin$\times$10 arcmin area with a spectral resolution of 50, which is suitable for serendipitous surveys. The data reduction is, however, rather complicated by the confusion of nearby sources after dispersing the spectra. To make efficient and reliable data reduction, we first compiled a point-source list from the reference image in each field-of-view and checked the overlaps of the spectra using their relative positions and fluxes. Applying this procedure to 886 mid-infrared slit-less spectroscopic data taken in the cryogenic phase, we obtained 862 mid-infrared spectra from 604 individual non-overlapping sources brighter than 1.5 mJy. We find a variety of objects in the spectroscopic catalogue, ranging from stars to galaxies. We also obtained a by-product catalogue of 9 $\mu$m point sources containing 42,387 objects brighter than 0.3 mJy. The spectroscopic and point-source catalogues are available online.