Abstract

Context. Diffuse interstellar bands (DIBs) are interstellar absorption features that widely exist in the optical and near-infrared wavelength range. DIBs play an important role in the lifecycle of the interstellar medium and can also be used to trace the Galactic structure.Aims. We developed a set of procedures to automatically detect and measure the DIB around 8620 angstrom (the Gaia DIB) for a wide range of temperatures. The method was tested on 5000 spectra from the Giraffe Inner Bulge Survey (GIBS) that has a spectral window similar to that of the Gaia-RVS spectra. Based on this sample, we studied the correlation between the equivalent width (EW) of the Gaia DIB and the interstellar reddening E(J - K-S) toward the inner Galaxy, as well as the DIB intrinsic properties.