Journal Article

Detecting sound-wave-like surface brightness ripples in cluster cores

J. Graham, A. C. Fabian and J. S. Sanders

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 4, pages 1749-1757
Published in print December 2008 | ISSN: 0035-8711
Published online December 2008 | e-ISSN: 1365-2966 | DOI:
Detecting sound-wave-like surface brightness ripples in cluster cores

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We investigate the observational requirements for the detection of sound-wave-like features in galaxy cluster cores. We calculate the effect of projection on the observed wave amplitude, and find that the projection factor depends only weakly on the underlying cluster properties but strongly on the wavelength of the sound waves, with the observed amplitude being reduced by a factor of ∼5 for 5 kpc waves but only by a factor of ∼2 for 25 kpc waves. We go on to estimate the time needed to detect ripples similar to those previously detected in the Perseus cluster in other clusters. We find that the detection time-scales most strongly with the flux of the cluster and the amplitude of the ripples. By connecting the ripple amplitude to the heating power in the system, we estimate detection times for a selection of local clusters and find that several may have ripples detected with ∼1-Ms Chandra time.

Keywords: galaxies: clusters: general; cooling flows; X-rays: galaxies: clusters

Journal Article.  5997 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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