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Title:
A deep Chandra observation of the Perseus cluster: shocks and ripples
Authors:
Fabian, A. C.; Sanders, J. S.; Allen, S. W.; Crawford, C. S.; Iwasawa, K.; Johnstone, R. M.; Schmidt, R. W.; Taylor, G. B.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AC(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AD(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AE(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AF(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AG(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA; Institut für Physik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany), AH(National Radio Astronomy Observatory, Socorro, NM 87801, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 344, Issue 3, pp. L43-L47. (MNRAS Homepage)
Publication Date:
09/2003
Origin:
MNRAS
MNRAS Keywords:
shock waves, galaxies: clusters: individual: Perseus, cooling flows, intergalactic medium, X-rays: galaxies: clusters
DOI:
10.1046/j.1365-8711.2003.06902.x
Bibliographic Code:
2003MNRAS.344L..43F

Abstract

We present preliminary results from a deep observation lasting almost 200 ks of the centre of the Perseus cluster of galaxies around NGC 1275. The X-ray surface brightness of the intracluster gas beyond the inner 20 kpc, which contains the inner radio bubbles, is very smooth apart from some low-amplitude quasi-periodic ripples. A clear density jump at a radius of 24 kpc to the north-east, about 10 kpc out from the bubble rim, appears to be due to a weak shock driven by the northern radio bubble. A similar front may exist around both inner bubbles but is masked elsewhere by rim emission from bright cooler gas. The continuous blowing of bubbles by the central radio source, leading to the propagation of weak shocks and viscously dissipating sound waves seen as the observed fronts and ripples, gives a rate of working which balances the radiative cooling within the inner 50 kpc of the cluster core.

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