ENERGY DEPOSITION PROFILES AND ENTROPY IN GALAXY CLUSTERS

Journal Article · Sat Nov 10 00:00:00 EST 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/759/2/87· OSTI ID:22086419

Chaudhuri, Anya; Majumdar, Subhabrata ^[1]

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1. Tata Institute of Fundamental Research 1, Homi Bhabha Road, Mumbai 400005 (India)

We report the results of our study of fractional entropy enhancement in the intracluster medium (ICM) of the clusters from the representative XMM-Newton cluster structure survey. We compare the observed entropy profile of these clusters with that expected for the ICM without any feedback, as well as with the introduction of preheating and cooling. We make the first estimate of the total, as well as radial, non-gravitational energy deposition up to r {sub 500} for this large, nearly flux-limited, sample of clusters. We find that the total energy deposition corresponding to the entropy enhancement is proportional to the cluster temperature (and hence cluster mass). The energy deposition per particle scaled by T {sub sp}, {Delta}E/T {sub sp} has a similar profile in all clusters, and is more pronounced in the central regions. Our results support models of entropy enhancement through active galactic nucleus feedback.

• OSTI ID: 22086419
• Journal Information: Astrophysical Journal, Vol. 759, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTRONOMY
ASTROPHYSICS
COMPARATIVE EVALUATIONS
COOLING
ENTROPY
FEEDBACK
GALAXY CLUSTERS
GALAXY NUCLEI
INTERSTELLAR SPACE
X-RAY GALAXIES