A Three-dimensional Decomposition of the Infrared Emission from Dust in the Milky Way

摘要

We have constructed a three-dimensional model of the Galactic large-scale infrared emission from dust associated with the molecular (H_2), neutral atomic (H I), and extended low-density (n-e 1100 cm~-3) ionized (H II) gas phases of the interstellar medium. The model incorporates a three-dimensional map of the molecular and neutral atomic hydrogen gas distributions, derived from available ~12CO and H I surveys by using the radial velocity information in the spectral lines as a distance indicator, and available 5 and 19 GHz radio continuum surveys to trace the column density of ionized gas.