We have combined infrared data with H _ { \sc { I } } , H _ { \sc { 2 } } and H _ { \sc { II } } surveys in order to spatially decompose the observed dust emission into components associated with different phases of the gas .
An inversion technique is applied .
For the decomposition , we use the IRAS 60 and 100 \mu m bands , the DIRBE 140 and 240 \mu m bands , as well as Archeops 850 and 2096 \mu m wavelengths .
In addition , we apply the decomposition to all five WMAP bands .
We obtain longitude and latitude profiles for each wavelength and for each gas component in carefully selected Galactic radius bins .
We also derive emissivity coefficients for dust in atomic , molecular and ionized gas in each of the bins .
The H _ { \sc { I } } emissivity appears to decrease with increasing Galactic radius indicating that dust associated with atomic gas is heated by the ambient interstellar radiation field ( ISRF ) .
By contrast , we find evidence that dust mixed with molecular clouds is significantly heated by O/B stars still embedded in their progenitor clouds .
By assuming a modified black-body with emissivity law \lambda ^ { -1.5 } , we also derive the radial distribution of temperature for each phase of the gas .
All of the WMAP bands except W appear to be dominated by emission from something other than normal dust , most likely a mixture of thermal bremstrahlung from diffuse ionized gas , synchrotron emission and spinning dust .
Furthermore , we find indications of an emissivity excess at long wavelengths ( \lambda \geq 850 \mu m ) in the outer Galaxy ( R > 8.9 kpc ) .
This suggests either the existence of a very cold dust component in the outer Galaxy or a temperature dependence of the spectral emissivity index .
Finally , it is shown that \sim 80 \% of the total FIR luminosity is produced by dust associated with atomic hydrogen , in agreement with earlier findings by Sodroski et al .
( 1997 ) . The work presented here has been carried out as part of the development of analysis tools for the planned European Space Agency ( ESA ) Planck mission .