Map of the overdensities of a large portion of the Universe (~ 1 Gpc^3).
Tomographic map of the Stripe 82 data. Map created with Lyman-alpha spectra from the Extended Baryon Oscillation Spectroscopic Survey (eBOSS). 3 isosurfaces in flux contrast (-0.15, -0.3, -0.45) are represented, which correspond to overdensities in the cosmic web.
Luminous spheroids mark the position of the quasars providing the Lyman-alpha forest spectra.
Larger spheres indicate the position and size of candidate protoclusters.
For more details, see https://arxiv.org/abs/2004.01448