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You are quite correct that any external observer will never see a true event horizon form, however they will see an apparent horizon and an apparent horizon generates Hawking radiation. So yes you will observe Hawking radiation from an object that is on its way to becoming a black hole.


Lets take this one at a time: When matter enters a black hole with a singularity What is matter? Ultimately matter is a bound complex of elementary particles and energy. There exist free, not in a composite structure, elementary particles with energy too, the electrons and the neutrinos and the photons. The photons in aggregate build up the ...


Here is the abstract of the original paper by Hawking: In the classical theory black holes can only absorb and not emit particles. However it is shown that quantum mechanical effects cause black holes to create and emit particles as if they were hot bodies with temperature hκ2/πk≈10^−6(M⊙/M)∘K where κ is the surface gravity of the black hole. This ...

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