  We propose an experiment to detect and characterize the analog Hawking
radiation in an analog model of gravity consisting of a flowing
exciton-polariton condensate. Under a suitably designed coherent pump
configuration, the condensate features an acoustic event horizon for sound
waves that at the semiclassical level is equivalent to an astrophysical black
hole horizon. We show that a continuous-wave pump-and-probe spectroscopy
experiment allows to measure the analog Hawking temperature from the dependence
of the stimulated Hawking effect on the pump-probe detuning. We anticipate the
appearance of an emergent resonant cavity for sound waves between the pump beam
and the horizon, which results in marked oscillations on top of an overall
exponential frequency dependence. We finally analyze the spatial correlation
function of density fluctuations and identify the hallmark features of the
correlated pairs of Bogoliubov excitations created by the spontaneous Hawking
process, as well as novel signatures characterizing the emergent cavity.
