The dust/gas correlation at high Galactic latitude
F. Boulanger, A. Abergel, J. P. Bernard, W. B. Burton, F. X. Desert, D. Hartmann, G. Lagache, J. L. Puget;
AaA, 1996, 312, 256
ABSTRACT:We have correlated the far-infrared emission from dust as measured by the DIRBE and FIRAS experiments with
the 21-cm emission from gas as measured by the Leiden/Dwingeloo survey of
HI in our Galaxy.
A tight correlation is observed at high |b| at
wavelengths ranging from 100{mu}m to 1mm.
The dust emission spectrum derived from
the correlation is fit well by a single Planck curve characterized by
T=17.5K and an emissivity proportional to {nu}^2^.
The dust emissivity
{tau}/N_H_=1.0x10^-25^ ({lambda}/250{mu}m)^-2^cm^2^ is remarkably close to the value in the
Draine and Lee (1984) dust model and is much smaller than values predicted for
porous or fractal grains.
In the emission from HI gas, we exclude the presence
of a very cold dust component with comparable emissivity, unless its
temperature is significantly smaller than 7K.
We also discuss the contribution
from Galactic molecular and ionized gas to the global IR emission.
KEYWORDS: ism: atoms, ism: dust, extinction, ism: molecules, ism: general, infrared: interstellar: continuum
PERSOKEY:fir, milky way, h_i, dust, 21 cm, ,
CODE: boulanger96