A quasar (the bright circle at the image center) is illuminating a cosmic filament, marked out in blue. [Credit: S. Cantalupo]

A quasar (the bright circle at the image center) is illuminating a cosmic filament, marked out in blue. [Credit: S. Cantalupo]

Astronomers have identified a filament in the cosmic web, which is the pattern formed by dark matter. That web in turn dictates the distribution of galaxies, since the dark matter attracts ordinary matter — atoms — through its gravity. However, it’s hard to spot the filaments connecting the different halos of dark matter, because they are far less massive and contain less gas than galaxies. The trick in this new study was to spot the faint glow of gas as it was lit up by a quasar: a bright energetic black hole in a nearby galaxy.

Sebastiano Cantapulo and colleagues observed the light emitted by the filament’s gas as it glowed under bombardment from a quasar, a powerful jet of particles propelled from a massive black hole. However, the researchers also found at least ten times more gas than expected from cosmological simulations, which suggests that there may be more gas between galaxies than models predict. [Read more....]

A glowing filament shows us where the dark matter hides

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