Incoherent X-ray emission?

Observed X-ray flux ~ 10 watts m Hz

at 1 kpc: I(n) = 10 watts

-30

-2

-1

=> incoherent in X-rays (& optical)

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This temperature is acceptable as it is much smaller than the temperature of about a million degrees Kelvin which is that expected for a neutron star.

Thus X-ray emission can be attributed to an incoherent mechanism in a neutron star. (Note that optical emission can also be due to an incoherent mechanism).

Thus different mechanisms are at work in different wavelengths - coherent in the radio but incoherent in the optical and X-rays.