Reconstruction of Gaia BP/RP spectra in crowded fields

Gaia will produce a catalogue of 1 billion of Milky Way stars, along with huge number of extragalactic and solar system's objects, changing drastically our vision of the sky. The photometric cameras will supply low resolution spectra (from 3 to 29 nm/pixel) in two bands, BP ( 300-660 nm) and RP (650-1000 nm) for all targets with magnitude G<20. This means that a large fraction of observed stars will be crowded. In this context, the development of an algorithm for the deblending of crowded images is a fundamental task and a real challenge.