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**Session 15 - Interstellar Medium I.**

*Display session, Monday, January 15*

*North Banquet Hall, Convention Center*

## [15.03] An Investigation of the Far-Infrared Emission of the Galaxy with DIRBE

*S. L. Snaith (Agnes Scott College/WIRO), D. R. Ciardi, R. R. Thompson (U. Wyoming/WIRO)*
We present a study of the diffuse infrared emission of the local interstellar medium for the region
42^\circ \leq l
\leq 146^\circ and 10^\circ \leq b \leq 50^\circ. The study was performed using the
DIRBE 90^\circ elongation data at 60\mum, 100\mum, 140\mum and 240\mu. We have used
a simple cosecant law for zodiacal emission removal and have calculated the mean flux density ratios for the six colors.
It is found that the I_60-I_100, I_60-I_140 and I_60-I_240 flux density ratios
deviate from the mean flux density ratios as a function of galactic longitude by an average of
36%, 50%, and 58%, respectively. The I_100-I_140, I_100-I_240 and
I_140-I_240 ratios show a similar but weaker longitude dependence.
This indicates that the smaller grains (a < 0.01\mum) in the diffuse
interstellar medium have a more variable population density than the population density of the larger
grains.

**Program
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