5 Infrared

図 6: Infrared

Composite mid-and far-infrared intensity observed by the Infrared Astronomical Satellite (IRAS) in 12, 60, and 100 micron wavelength bands. The images are encoded in the blue, green, and red color ranges, respectively. Most of the emission is thermal, from interstellar dust warmed by absorbed starlight, including star-forming regions embedded in interstellar clouds. The display here is a mosaic of IRAS Sky Survey Atlas images. Emission from interplanetary dust in the solar system, the "zodiacal emission," was modeled and subtracted in the production of the Atlas.

$$3.0\times 10^{3} \sim 25\times 10^{3} {\rm GHz} =0.0000119917 \sim 0.0000999308 {\rm m} =12 \sim 100 {\rm\mu m}$$