Abstract
The Far-Infrared Line Mapper (FILM) onboard the Infrared Telescope in Space (IRTS) made a survey for the far-infrared (C ii) 158m line emission with high sensitivity and moderate spatial resolution. We have found that diuse (C ii) line emission extends to high Galactic latitude regions. The (C ii) line intensity atjbj60 ranges from 2 10 7 to 1:5 10 6 erg cm 2 s 1 sr 1 . Comparisons of the distribution of the (C ii) line emission with those of the H i column density and far-infrared radiation show some correlations, but the (C ii) line emission diers from the far-IR and HI emission at high Galactic latitudes. These dierences suggest that the (C ii )l ine primarily comes from ionized gas in the high-latitude regions. The intensities of the (C ii) line emission on the southern side ( b 0). We infer from this dierence that there is a displacement of the Sun with respect to the center of interstellar medium from which the (C ii) line comes. When an exponential distribution is assumed for the (C ii) emitting gas, it is expected that the Sun is located at the distance of about 17% of the scale height above the center of the gas. This is consistent with the previously reported displacement of the Sun from the Galactic plane.
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