On the Spectral Cubes and Moment Maps from the Galaxy Datacubes Outputed by SÍGAME

Simulator of Galaxy Millimeter/submillimeter Emission (SÍGAME) is a framework that derives far-infrared (FIR) line emissions for particle-based cosmological hydrodynamics simulations galaxies using a postprocessing step that applies radiative transfer and other physics. Using the outputs from SÍGAME, we present a method to create spectral cubes, moment maps, and line profiles of these galaxies. The output galaxy data cubes from SÍGAME contain spatial information, cell sizes, and cell luminosities, which were combined to attain the surface brightness of each pixel, creating moment0 maps of these galaxies by weighing each cell by its volume filling factor in the column covered by each pixel. This algorithm was further extended to integrate the velocity profiles of each cell to create spectral cubes, which were used to generate moment1 maps and line profiles. We also present the use of these moment maps and line profiles to understand the physics of the interstellar medium (ISM) of these galaxies as the same algorithm can also be used to derive the maps of other properties, including surface mass density, star formation rate, and hydrogen density.