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galactic and extragalactic astronomy > galaxy cluster > cooling flow
... > classical mechanics aspects > continuum mechanics > fluid mechanics > fluid dynamics > fluid flow > gas flow > cooling flow
... > theoretical physics aspects > field theory > classical field theory > continuum mechanics > fluid mechanics > fluid dynamics > fluid flow > gas flow > cooling flow

Terme préférentiel

cooling flow  

Définition

  • A cooling flow occurs according to the theory that the intracluster medium (ICM) in the centres of galaxy clusters should be rapidly cooling at the rate of tens to thousands of solar masses per year. This should happen as the ICM (a plasma) is quickly losing its energy by the emission of X-rays. The X-ray brightness of the ICM is proportional to the square of its density, which rises steeply towards the centres of many clusters. Also the temperature falls to typically a third or a half of the temperature in the outskirts of the cluster. The typical [predicted] timescale for the ICM to cool is relatively short, less than a billion years. As material in the centre of the cluster cools out, the pressure of the overlying ICM should cause more material to flow inwards (the cooling flow). (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Cooling_flow)

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http://data.loterre.fr/ark:/67375/MDL-PHBB3VTV-H

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