GAS CLUMPING IN THE OUTSKIRTS OF {Lambda}CDM CLUSTERS

Journal Article · Sun Apr 10 00:00:00 EDT 2011 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/731/1/L10· OSTI ID:21562744

Nagai, Daisuke ^[1]

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1. Department of Physics, Yale University, New Haven, CT 06520 (United States)

Recent Suzaku X-ray observations revealed that the observed entropy profile of the intracluster medium (ICM) deviates significantly from the prediction of hydrodynamical simulations of galaxy clusters. In this work, we show that gas clumping introduces significant biases in X-ray measurements of the ICM profiles in the outskirts of galaxy clusters. Using hydrodynamical simulations of galaxy cluster formation in a concordance {Lambda}CDM model, we demonstrate that gas clumping leads to an overestimate of the observed gas density and causes flattening of the entropy profile. Our results suggest that gas clumping must be taken into account when interpreting X-ray measurements of cluster outskirts.

• OSTI ID: 21562744
• Journal Information: Astrophysical Journal Letters, Vol. 731, Issue 1; Other Information: DOI: 10.1088/2041-8205/731/1/L10; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ENTROPY
GALAXY CLUSTERS
HYDRODYNAMICS
SIMULATION
X-RAY GALAXIES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
FLUID MECHANICS
GALAXIES
MECHANICS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES