Low-luminosity active galactic nuclei are strong sources of X-ray emission
produced by Compton scattering originating from the accretion flows surrounding
their supermassive black holes. The shape and energy of the resulting spectrum
depend on the shape of the underlying electron distribution function (DF). In
this work, we present an extended version of the grmonty code, called
κmonty. The grmonty code previously only included a thermal Maxwell
J\"utner electron distribution function. We extend the gromty code with
non-thermal electron DFs, namely the κ and power-law DFs, implement
Cartesian Kerr-Schild coordinates, accelerate the code with MPI, and couple the
code to the non-uniform AMR grid data from the GRMHD code BHAC. For the Compton
scattering process, we derive two sampling kernels for both distribution
functions. Finally, we present a series of code tests to verify the accuracy of
our schemes. The implementation of non-thermal DFs opens the possibility of
studying the effect of non-thermal emission on previously developed black hole
accretion models.Comment: 12 pages, 9 figures, submitted to journa