The extended ROSAT-ESO Flux-Limited X-ray Galaxy Cluster Survey (REFLEX II) V. Exploring a local underdensity in the Southern Sky

Understand

Several claims have been made that we are located in a locally underdense region of the Universe based on observations of supernovae and galaxy density distributions.

• Two recent studies of K-band galaxy surveys have provided new support for a local underdensity in the galaxy distribution out to distances of 200 - 300 Mpc.
• If confirmed, such large local underdensities would have important implications on the interpretation of local measurements of cosmological parameters.
• Galaxy clusters have been shown to be ideal probes to trace the large-scale structure of the Universe.