Galaxies are distributed throughout the universe as a complex network of nodes connected by fibers, so they are separated by gaps. This is called a space network.
The fibers are thought to contain almost all of the common matter (known as the baryonic) of the universe in the form of hot, diffuse gas. However, the signal emitted from this diffuse gas is so weak that, in fact, 40 to 50% of the baryon goes undetected.
These missing baryons are hidden in the filamentous structure of the cosmic lattice.
Nabila Aghanim, a researcher at the Institut d’Astrophysique Spatiale (CNRS / Université Paris-Saclay), and Hideki Tanimura, a postdoctoral researcher, along with their colleagues, are trying to spot them. In fact, in a new study, they presented a statistical analysis that showed for the first time X-ray emission from hot baryons in filament.
The team used the spatial correlation between the position of the strands and the associated X-ray emission to provide evidence of the presence of hot gas in the cosmic lattice and measure its temperature for the first time. first. The detection is based on a stacked X-ray signal, in the ROSAT2 survey data, from about 15,000 large-scale cosmic fibers identified in the SDSS3 galaxy survey.
These findings confirm previous analyzes by the same team, based on indirect detection of hot gas in the cosmic lattice through its effect on the cosmic microwave background. This paves the way for more detailed studies, using better quality data, to examine gas development in the filamentous structure of the cosmic lattice.
- H. T Tanimura et al. Discovered for the first time stacked X-ray emissions from space lattice fibers, Astronomy & Astrophysics (2020). DOI: 10.1051 / 0004-6361 / 202038521