Bessel Filter -3dB frequency

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The documentation for besself states: "[b,a] = besself(n,Wo) returns the transfer function coefficients of an nth-order lowpass analog Bessel filter, where Wo is the angular frequency up to which the filter's group delay is approximately constant."

Is there a way to determine what frequency one should input in order to obtain a -3dB amplitude response at a specific frequency?

I realize the bessel filter is used primarily for its phase response and group delay, but I would like to plot the response of several poles of filters all normalized to -3dB at 1 rad/sec for comparison purposes as is often done with the butterworth filter.

Thanks for any help you can provide