Il faut probablement ajouter à cela le spectre du soleil lui-même. Il produit moins de violet que de bleu.

Second, the decision to split the sky in two dates back from way before. It was a decision made by the collaboration (but mostly pushed for by the Russians) on how to share / work on the data. Germany committed to making their share public. We do not know what Russia will do in the future.

Actually, this is not exactly what happened. First, the Russian would have had no problem going on with the survey. The decision to pause after only half the data were obtained comes from Germany (more precisely, the European sanctions against the Russian invasion, which forbid such collaboration).

Given the weakness of the signaI, it however remains unclear at this point whether we do detect the diffuse gas in this filament or just the cumulative emission of all the small galaxy groups and galaxies that it contains.

This is the longest filament in which such a detection was possible, but also the clearest because the clusters are so well separated in the sky.

Large-scale filaments between galaxy clusters are expected to contain 30% of the normal matter in the local Universe but this has hardly ever been observed in practice.

Those seen outside the galactic plane are supermassive black holes in distant galaxies (active nuclei) or clusters of galaxies, themselves containing up to 1000 galaxies!

The bright and more compact sources located close to the galactic plane are mainly pulsars (rotating neutron stars), binary systems consisting of a star rotating around a neutron star or a black hole, or the hot material left over by ancient supernova explosions.

The dark horizontal line in the middle corresponds to the plane of the Milky Way, which absorbs the X-rays. The two yellow circular structures in the centre are the eROSITA bubbles, and appear to originate from matter ejected by the supermassive black hole at the centre of our Galaxy.

Celles que l'on voit en dehors du plan galactique sont des trous noirs supermassifs dans des galaxies distantes (noyaux actifs) ou bien des amas de galaxies, contenant eux-mêmes jusqu'à 1000 galaxies !

Les sources brillantes, plus compactes, situées près du plan galactique sont principalement des pulsars (étoiles à neutron en rotation), des systèmes binaires constitués d'une étoile tournant autour d'une étoile à neutron ou d'un trou noir, ou bien les restes d'anciennes explosions de supernovae.

Le trait horizontal sombre, au milieu, correspond au plan de la Voie Lactée, qui absorbe les rayons X. Les deux structures circulaires jaunes, au centre, son les bulles d'eROSITA et semblent provenir de matière éjectée depuis les environs du trou noir supermassif situé au centre de la Galaxie.