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Context: We investigate the possible theoretical properties of the putativepulsar associated with the pulsar wind nebula IGR J18135-1751/HESS J1813-178based upon recent gamma-ray observations and archival multi-wavelengthobservations. Aims: We show that when using the standard equations for magneticdipole radiation with recent soft gamma-ray observations leads to deriving anextreme set of parameters (magnetic field, period and spin down rate) for theputative pulsar. Alternative scenarios that generate more typical parametervalues are explored. Methods: The properties of the putative pulsar arecalculated assuming that the 20-100 keV luminosity corresponds to 1% of Edot,that the source is 4.5 kpc away, and that the pulsar age is 300 yrs. This givesP = 0.55 s, Pdot = 3E-11 s/s, and B = 1.28E14 G. This is a very extreme setcompared to the population of known pulsars in PWN systems. Using the equationsfor magnetic dipole losses makes it possible to adjust the initial assumptionsto see what is required for a more reasonable set of pulsar parameters.Results: The current measured properties for IGR J18135-1751/HESS J1813-178(i.e. luminosity, distance, and age) result in extreme properties of the unseenpulsar within the PWN. The simplest method for achieving more reasonableproperties for the pulsar is to decouple the spin-down age of the pulsar fromthe actual age for the system.

The properties of the putative pulsar associated with IGR J18135-1751/HESS J1813-178