Detection of the Mid-Infrared Unidentified Bands in the Diffuse Galactic Emission by IRTS

Details Detection of the Mid-Infrared Unidentified Bands in the Diffuse Galactic Emission by IRTS Detection of the Mid-Infrared Unidentified Bands in the Diffuse Galactic Emission by IRTS

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48l..59o&link_type=abstract

Publications of the Astronomical Society of Japan, v.48, p.L59-L63.

Astronomy and Astrophysics

Astronomy

103

Infrared: Diffuse Emission, Infrared: Spectra, Interstellar: Dust, Spacecraft

Scientific paper

This letter presents the first results of the mid-infrared spectrum (4.5--11.7 mu m) of the diffuse emission near to the galactic plane (l ~ 50(deg) ; |b| <= 5(deg) ) obtained by the mid-infrared spectrometer on board the Infrared Telescope in Space mission. The results clearly demonstrate the presence of unidentified infrared emission (UIR) bands at 6.2, 7.7, 8.6, and 11.3 mu m in the diffuse galactic emission. The distribution of the UIR bands correlates well with the IRAS 100 mu m map, suggesting that the UIR-band emitting material is well mixed with the classical dust grains in general interstellar space. The present results indicate that more than 70% of the IRAS 12 mu m flux diffuse emission is emitted in the spectral range 8--11.7 mu m, and that most of the 12 mu m excess comes from the features associated with the UIR bands.

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