X-ray surface brightness and gas density fluctuations in the Coma cluster
By E. Churazov, A. Vikhlinin, I. Zhuravleva, A. Schekochihin, I. Parrish, R. Sunyaev, W. Forman, H. Böhringer, S. Randall. 2011
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X-ray surface brightness fluctuations in the core (650 × 650 kpc) region of the Coma cluster observed with XMM-Newton and Chandra are analyzed using a 2D power spectrum approach. The resulting 2D spectra are converted to 3D power spectra of gas density fluctuations. The characteristic amplitude of the volume filling density fluctuations relative to the smooth underlying density distribution varies from 7-10% on scales of �500 kpc down to �5% at scales � 30 kpc. On smaller spatial scales, projection effects smear the density fluctuations by a large factor, precluding strong limits on the fluctuations in 3D. On the largest scales probed (hundreds of kpc), the dominant contributions to the observed fluctuations most likely arise from perturbations of the gravitational potential by the two most massive galaxies in Coma, NGC4874 and NGC4889, and the low entropy gas brought to the cluster by an infalling group. Other plausible sources of density fluctuations are discussed, including turbulence, metal abundance variations, and unresolved sources.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/2536099c8378c8559ca936a026044a84ccb2dd27
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In Astronomy and Astrophysics
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- Chaotic cold accretion on to black holes (2013, background): “In fact, such a level of velocity fluctuations seems to be very common in gaseous haloes (e.g. Schuecker et al. 2004; Rebusco et al. 2006; Churazov et al. 2012; de Plaa et al. 2012; Sanders & Fabian 2013; and even higher in the ISM; Vazquez-Semadeni 2012) and can be confirmed by the upcoming…”