| Cluster Cooling Flows: Now |
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| * | The Reflection
Grating |
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| Spectrometer on
XMM-Newton is |
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| the first
instrument capable of |
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| quantitatively
testing the explicit |
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| cooling flow
spectral predictions |
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| for a broad
sample of clusters. |
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| * | Surprisingly, we
have found a |
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| systematic
deficit of low |
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| temperature
emission in all cases, |
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| starting at
roughly half the |
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| background
temperature. |
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| * | This effect has
been difficult to |
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| reconcile with
any of the standard |
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| theoretical
models. |
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| Peterson et
al., 2002, in preparation. |