Diffuse far-infrared [C II] line emission from high Galactic latitude

Details Diffuse far-infrared [C II] line emission from high Galactic latitude Diffuse far-infrared [C II] line emission from high Galactic latitude

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...382..600m&link_type=abstract

Astronomy and Astrophysics, v.382, p.600-609 (2002)

Astronomy and Astrophysics

Astrophysics

5

Lnfrared: Ism, Ism: Lines And Bands, Ism: Structure, Galaxy: General

Scientific paper

The Far-Infrared Line Mapper (FILM) onboard the Infrared Telescope in Space (IRTS) made a survey for the far-infrared [C Ii] 158 mu m line emission with high sensitivity and moderate spatial resolution. We have found that diffuse [C Ii] line emission extends to high Galactic latitude regions. The [C Ii] line intensity at | b | ~ 60deg ranges from 2*E-7 to 1.5*E-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 differs from the far-IR and HI emission at high Galactic latitudes. These differences suggest that the [C Ii] line primarily comes from ionized gas in the high-latitude regions. The intensities of the [C Ii] line emission on the southern side (b < 0deg) of the Galactic plane are systematically larger than those on the northern side (b > 0deg). We infer from this difference 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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