2019/05/20 by R. Brent Tully, R Brent Tully, Daniel Pomarède +7 · 11 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.3847/1538-4357/ab2597
18 pages; 9 figures; links to 1 video and 2 interactive models
arxiv created 2019/05/20 · openalex publication_date 2019/07/20 · openalex created_date 2019/07/30 · arxiv updated 2019/07/31 · openalex updated_date 2026/07/28
Cosmicflows-3 distances and inferred peculiar velocities of galaxies have permitted the reconstruction of the structure of over and under densities within the volume extending to 0.05c. This study focuses on the under dense regions, particularly the Local Void that lies largely in the zone of obscuration and consequently has received limited attention. Major over dense structures that bound the Local Void are the Perseus-Pisces and Norma-Pavo-Indus filaments separated by 8,500 km/s. The void network of the universe is interconnected and void passages are found from the Local Void to the adjacent very large Hercules and Sculptor voids. Minor filaments course through voids. A particularly interesting example connects the Virgo and Perseus clusters, with several substantial galaxies found along the chain in the depths of the Local Void. The Local Void has a substantial dynamical effect, causing a deviant motion of the Local Group of 200-250 km/s. The combined perturbations due to repulsion from the Local Void and attraction toward the Virgo Cluster account for about 50% of the motion of the Local Group in the rest frame given by the cosmic microwave background.