Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1208c&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #12.08; Bulletin of the American Astronomical Society, Vol. 26, p.1327
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an investigation of the spatial and temperature structure of the diffuse infrared emission in the northern half of the first quadrant of the Galaxy using the IRAS data set. The diffuse infrared emission is shown to follow a csc(|b|) law in all four IRAS bands. The ratio of I_{60microns } vs I_{100microns } for the diffuse infrared emission is found to be 0.203 (+/- 0.001). The ratio of I_{12microns } vs I_{25microns } is 0.76 (+/- 0.01). The IRAS flux ratios indicate average dust temperatures for the diffuse infrared emission of 25 K for the 60 microns and 100 microns bands and 200 K for the 12 microns and 25microns bands. In addition, a deep trough has been discovered in the 12 microns band; the trough is parallel to the Galactic plane, is centered at Galactic latitude b = 40(deg) and is approximately 10(deg) in width. The trough also appears at 25 microns but is less pronounced. The trough is not present in the 60 microns and 100 microns bands. For the trough, the ratio of I_{12microns } vs I_{25microns } is 0.085 (+/- 0.02). The IRAS flux ratios indicate average dust temperatures for the trough of 25 K for the 60 microns and 100 microns bands but only 110 K for the 12 microns and 25microns bands.
Canterna Ron W.
Ciardi David R.
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