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Black widow and redback systems are compact binaries in which a millisecondpulsar heats and may even ablate its low-mass companion by its intense wind ofrelativistic particles and radiation. In such systems, an intrabinary shock canform as a site of particle acceleration and associated non-thermal emission. Wemodel the X-ray and gamma-ray synchrotron and inverse-Compton spectralcomponents for select spider binaries, including diffusion, convection andradiative energy losses in an axially-symmetric, steady-state approach. Our newmulti-zone code simultaneously yields energy-dependent light curves and orbitalphase-resolved spectra. Using parameter studies and matching the observed X-rayspectra and light curves, and Fermi Large Area Telescope spectra whereavailable, with a synchrotron component, we can constrain certain modelparameters. For PSR J1723--2837 these are notably the magnetic field and bulkflow speed of plasma moving along the shock tangent, the shock accelerationefficiency, and the multiplicity and spectrum of pairs accelerated by thepulsar. This affords a more robust prediction of the expected high-energy andvery-high-energy gamma-ray flux. We find that nearby pulsars with hot orflaring companions may be promising targets for the future Cherenkov TelescopeArray. Moreover, many spiders are likely to be of significant interest tofuture MeV-band missions such as AMEGO and e-ASTROGAM.

X-ray Through Very-High-Energy Intrabinary Shock Emission from Black Widows and Redbacks