Fig. 12
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The ionizing photon rate per unit area of Cyg OB2. Left: map of the ionizing photon (>13.6 eV) rate per unit area constructed from the observed OB stars of the Cyg OB2 association (for details, see Appendix B). Green contours are shown at log(Q0/area [photons s−1 cm−2]) = (9,9.25,9.5, …12.25). Right: ionizing photon rate per unit area as traced by thermal free-free emission. The green contours of the Cyg OB2 ionizing field are overlaid.
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