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Space Science Reviews

, 215:7 | Cite as

The Physics of Galaxy Cluster Outskirts

  • Stephen WalkerEmail author
  • Aurora Simionescu
  • Daisuke Nagai
  • Nobuhiro Okabe
  • Dominique Eckert
  • Tony Mroczkowski
  • Hiroki Akamatsu
  • Stefano Ettori
  • Vittorio Ghirardini
Article
Part of the following topical collections:
  1. Clusters of Galaxies: Physics and Cosmology

Abstract

As the largest virialized structures in the universe, galaxy clusters continue to grow and accrete matter from the cosmic web. Due to the low gas density in the outskirts of clusters, measurements are very challenging, requiring extremely sensitive telescopes across the entire electromagnetic spectrum. Observations using X-rays, the Sunyaev–Zeldovich effect, and weak lensing and galaxy distributions from the optical band, have over the last decade helped to unravel this exciting new frontier of cluster astrophysics, where the infall and virialization of matter takes place. Here, we review the current state of the art in our observational and theoretical understanding of cluster outskirts, and discuss future prospects for exploration using newly planned and proposed observatories.

Keywords

Galaxy clusters Intracluster matter 

Notes

Acknowledgements

S.W. was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by the Universities Space Research Association through a contract with NASA. A.S. gratefully acknowledges support by the Women In Science Excel (WISE) programme of the Netherlands Organisation for Scientific Research (NWO). D.N. acknowledges Yale University for granting a triennial leave and the Max-Planck-Institut für Astrophysik for hospitality when this work was completed. N.O. was supported by the Funds for the Development of Human Resources in Science and Technology under MEXT, Japan and Core Research for Energetic Universe in Hiroshima University (the MEXT program for promoting the enhancement of research universities, Japan). T.M. is supported for scientific activities by ESO’s Directorate for Science. H.A. acknowledges the support of NWO via a Veni grant. S.E. acknowledges financial contribution from the contracts NARO15 ASI-INAF I/037/12/0, ASI 2015-046-R.0 and ASI-INAF n.2017-14-H.0. SRON is supported financially by NWO, the Netherlands Organization for Scientific Research.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • Stephen Walker
    • 1
    Email author
  • Aurora Simionescu
    • 2
    • 3
  • Daisuke Nagai
    • 4
    • 5
  • Nobuhiro Okabe
    • 6
  • Dominique Eckert
    • 7
  • Tony Mroczkowski
    • 8
  • Hiroki Akamatsu
    • 2
  • Stefano Ettori
    • 9
    • 10
  • Vittorio Ghirardini
    • 9
    • 11
  1. 1.Astrophysics Science Division, X-ray Astrophysics Laboratory, Code 662NASA Goddard Space Flight CenterGreenbeltUSA
  2. 2.SRON, Netherlands Institute for Space ResearchUtrechtThe Netherlands
  3. 3.Institute of Space and Astronautical Science (ISAS)JAXASagamiharaJapan
  4. 4.Department of PhysicsYale UniversityNew HavenUSA
  5. 5.Yale Center for Astronomy and AstrophysicsNew HavenUSA
  6. 6.Department of Physical ScienceHiroshima UniversityHigashi-HiroshimaJapan
  7. 7.Max-Planck-Institut für extraterrestrische PhysikGarchingGermany
  8. 8.European Southern Observatory (ESO)GarchingGermany
  9. 9.Osservatorio di Astrofisica e Scienza dello SpazioINAFBolognaItaly
  10. 10.INFN, Sezione di BolognaBolognaItaly
  11. 11.Dipartimento di Fisica e Astronomia Università di BolognaBolognaItaly

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