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Setting Limits on Supersymmetry Using Simplified Models
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Published on: November 15, 2013

Searching for the missing baryons in clusters.

Bilhuda Rasheed1, Neta Bahcall, Paul Bode

  • 1Department of Astrophysical Sciences, 4 Ivy Lane, Peyton Hall, Princeton University, Princeton, NJ 08544, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 16, 2011
PubMed
Summary
This summary is machine-generated.

The "missing baryon" puzzle in galaxy clusters is solved: baryons are not missing but extended to larger radii. Gas fractions increase with radius, reaching cosmic values near the virial radius, likely due to heating processes.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Galaxy Evolution

Background:

  • Galaxy clusters appear to have fewer baryons (gas and stars) than expected based on the cosmic baryon fraction.
  • This

Purpose of the Study:

  • To investigate the distribution of baryons within galaxy clusters.
  • To determine if baryons are truly missing or simply located in unobserved regions.

Main Methods:

  • Analyzing observed gas and mass density profiles in galaxy clusters.
  • Extrapolating baryon fraction as a function of radius and cluster mass.

Main Results:

  • Baryon deficiency is primarily observed in the central regions of clusters (within ~0.5 virial radius).
  • Gas density profiles are shallower than mass density profiles, indicating gas is more extended than mass.
  • Baryon fraction reaches the cosmic value near the virial radius for massive clusters (> ~5 x 10^13 M☉).

Conclusions:

  • Baryons are not missing from galaxy clusters but are located in their outskirts.
  • Heating processes like shock-heating, supernovae, and AGN feedback likely cause this extended distribution.
  • Future observations are expected to detect these extended baryons.