Volume 382, Number 2, FebruaryI 2002
|Page(s)||600 - 609|
|Published online||15 February 2002|
Diffuse far-infrared  line emission from high Galactic latitude
The Institute of Space and Astronautical Science (ISAS), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
2 Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
3 Gunma Astronomical Observatory, 6860-86 Nakayama, Takayama, Agatsuma Gunma, 377-0702, Japan
4 Communications Reserch Laboratory, 4-2-1 Nukui-kitamachi, Koganei, Tokyo 184-8795, Japan
5 Kansai Advanced Research Center, Communications Research Laboratory, 588-2 Iwaoka, Nishi-ku, Kobe 651-2492, Japan
6 College of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan
Corresponding author: S. Makiuti, email@example.com
Accepted: 30 October 2001
The Far-Infrared Line Mapper (FILM) onboard the Infrared Telescope in Space (IRTS) made a survey for the far-infrared  158 μm line emission with high sensitivity and moderate spatial resolution. We have found that diffuse  line emission extends to high Galactic latitude regions. The  line intensity at ranges from to . Comparisons of the distribution of the  line emission with those of the column density and far-infrared radiation show some correlations, but the  line emission differs from the far-IR and HI emission at high Galactic latitudes. These differences suggest that the  line primarily comes from ionized gas in the high-latitude regions. The intensities of the  line emission on the southern side () of the Galactic plane are systematically larger than those on the northern side (). We infer from this difference that there is a displacement of the Sun with respect to the center of interstellar medium from which the  line comes. When an exponential distribution is assumed for the  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.
Key words: lnfrared: ISM / ISM: lines and bands / ISM: structure / Galaxy: general
© ESO, 2002
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