Internal calibration of Gaia BP/RP low-resolution spectra

Understand

The full third Gaia data release will provide the calibrated spectra obtained with the blue and red Gaia slit-less spectrophotometers.

• The main challenge when facing Gaia spectral calibration is that no lamp spectra or flat fields are available during the mission.
• Also, the significant size of the line spread function with respect to the dispersion of the prisms produces alien photons contaminating neighbouring positions of the spectra.
• This makes the calibration special and different from standard approaches.