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High energy radiation from nonthermal particles accelerated in relativisticmagnetic reconnection is thought to be important in many astrophysical systems,ranging from blazar jets and black hole accretion disk coronae to pulsars andmagnetar flares. The presence of a substantial density of high energy photons($>$MeV) in these systems can make two-photon pair production ($\gamma\gamma\toe^-e^+$) an additional source of plasma particles and can affect the radiativeproperties of these objects. We present the results of novel particle-in-cellsimulations that track both the radiated synchrotron photons and the createdpairs, with which we study the evolution of a two-dimensional reconnectingcurrent sheet in pair plasma. Synchrotron radiation from accelerated particlesin the current sheet produces hot secondary pairs in the upstream which arelater advected into the current sheet where they are reaccelerated and producemore photons. In the optically thin regime, when most of the radiation isleaving the upstream unaffected, this process is self-regulating and dependsonly on the background magnetic field and the optical depth of photons to pairproduction. The extra plasma loading also affects the properties ofreconnection. We study how the inflow of the secondary plasma, withmultiplicities up to several hundred, reduces the effective magnetization ofthe plasma, suppressing the acceleration and thus decreasing the high energyphoton spectrum cutoff. This offers an explanation for the weak dependence ofthe observed gamma-ray cutoff in pulsars on the magnetic field at the lightcylinder.

Effects of synchrotron cooling and pair production on collisionless relativistic reconnection