Bibcode
Sereno, M.; Giocoli, Carlo; Izzo, Luca; Marulli, Federico; Veropalumbo, Alfonso; Ettori, Stefano; Moscardini, Lauro; Covone, Giovanni; Ferragamo, A.; Barrena, R.; Streblyanska, A.
Bibliographical reference
Nature Astronomy, Volume 2, p. 744-750
Advertised on:
7
2018
Citations
18
Refereed citations
14
Description
Galaxy clusters form at the highest-density nodes of the cosmic
web1,2. The clustering of dark matter halos hosting these
galaxy clusters is enhanced relative to the general mass distribution,
with the matter density beyond the virial region being strongly
correlated to the halo mass (halo bias)3. Halo properties
other than mass can further enhance the halo clustering (secondary
bias)4-7. Observational campaigns have ascertained the halo
bias8-10, but efforts to detect this secondary bias for
massive halos have been inconclusive11-13. Here, we report
the analysis of the environment bias in a sample of massive clusters,
selected through the Sunyaev-Zel'dovich effect by the Planck
mission14,15, focusing on the detection of the environment
dark matter correlated to a single cluster, PSZ2 G099.86+58.45. The
gravitational lensing signal of the outskirts is very large and can be
traced up to 30 megaparsecs with a high signal-to-noise ratio (about
3.4), implying environment matter density in notable excess of the
cosmological mean. Our finding reveals this system to be extremely rare
in the current paradigm of structure formation and, implies that
enhancing mechanisms around high-mass halos can be very effective.
Future lensing surveys will probe the surroundings of single haloes,
enabling the study of their formation and evolution of structure.
Related projects
![The photograph is a combination of visible and near-infrared light, the immense cluster is a rich mix of galaxy shapes. The brightest and largest galaxies in the cluster are the yellow-white, massive, elliptical galaxies containing many hundreds of billions of stars each. Spiral galaxies — like our Milky Way — have younger populations of stars and are bluish. NASA, ESA, and J. Lotz and the HFF Team (STScI) Abell 370 is located approximately 4 billion light-years away in the constellation Cetus, the Sea Monster](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/project/Imagen%20Jairo.png?itok=-47xHY8B)
Galaxy Evolution in Clusters of Galaxies
Galaxies in the universe can be located in different environments, some of them are isolated or in low density regions and they are usually called field galaxies. The others can be located in galaxy associations, going from loose groups to clusters or even superclusters of galaxies. One of the foremost challenges of the modern Astrophysics is to
Jairo
Méndez Abreu
![We can’t see dark matter, but its gravity sculpts what we do see from our vantage point inside the Milky Way galaxy. This supercomputer simulation, which looks at our cosmic neighborhood from the outside, is a realistic, data-driven reconstruction of the web of dark matter that guided galaxies to their present positions. Where huge dark tendrils cross, bright galaxies cluster; the Virgo cluster alone includes thousands. Simulation and Reconstruction: Steffen Hess and Francisco-Shu Kitaura, Leibniz Institute for Astrophysics Potsdam. Visualization: Tom Abel and Ralf Kaehler. Credits: National Geographic The Invisible Scaffolding of Space](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/project/Imagen%20Kitaura.jpg?h=b3e11503&itok=8oVjxQtK)
Cosmology with Large Scale Structure Probes
The Cosmic Microwave Background (CMB) contains the statistical information about the early seeds of the structure formation in our Universe. Its natural counterpart in the local universe is the distribution of galaxies that arises as a result of gravitational growth of those primordial and small density fluctuations. The characterization of the
FRANCISCO SHU
KITAURA JOYANES