Observed Non-Steady State Cooling and the Moderate Cluster Cooling Flow Model

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dc.creatorSoker, Noam
dc.creatorDavid, Laurence P.
dc.date2003-02-19
dc.date.accessioned2026-07-07T10:26:50Z
dc.date.available2026-07-07T10:26:50Z
dc.descriptionWe examine recent developments in the cluster cooling flow scenario following recent observations by Chandra and XMM-Newton. We show that the distribution of gas emissivity verses temperature determined by XMM-Newton gratings observations demonstrates that the central gas in cooling flow clusters cannot be in simple steady-state. Combining this result with the lack of spectroscopic evidence for gas below one-third of the ambient cluster temperature is strong evidence that the gas is heated intermittently. While the old steady-state isobaric cooling flow model is incompatible with recent observations, a "moderate cooling flow model", in which the gas undergoes intermittent heating that effectively reduces the age of a cooling flow is consistent with observations. Most of the gas within cooling flows resides in the hottest gas, which is prevented from cooling continuously and attaining a steady-state configuration. This results in a mass cooling rate that decreases with decreasing temperature, with a much lower mass cooling rate at the lowest temperatures. The present paper strengthens the moderate cooling flow model, which can accommodate the unique activities observed in cooling flow clusters.
dc.descriptionApJ, in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0302384
dc.identifierhttp://arxiv.org/abs/astro-ph/0302384
dc.identifierAstrophys.J.589:770-773,2003
dc.identifierdoi:10.1086/374815
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176978
dc.subjectAstrophysics
dc.titleObserved Non-Steady State Cooling and the Moderate Cluster Cooling Flow Model
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