Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992isas.rept.....s&link_type=abstract
Institute of Space and Astronautical Science, Report no. 650
Astronomy and Astrophysics
Astronomy
Far Infrared Radiation, Infrared Telescopes, Balloon-Borne Instruments, Emission Spectra, Positive Ions, Molecular Gases, Carbon, Reflecting Telescopes, Infrared Astronomy Satellite, Onboard Equipment, Attitude Control
Scientific paper
A far-infrared emission line of the C(+) ion (forbidden CII 158-micron transition) was detected in an extensive region (30 deg less than/equal to l less than/equal to 51 deg) along the Galactic plane. The forbidden CII line is bright and extended far from discrete luminous HII regions. The diffuse forbidden CII emission probably comes from the photodissociated C+ regions enveloping giant molecular clouds exposed to the general interstellar UV radiation field, namely, 'diffuse photodissociation regions'. The Balloon-Borne Infrared Telescope (BIRT) was used for the observations. It was developed for far-infrared astronomy by a joint project (the BIRT project) between the Institute of Space and Astronautical Science and Kyoto University in Japan. BIRT has a 50-cm reflector telescope mounted on an alt-azimuthal pointing system actuated by a control-moment gyroscope torquer in the azimuth. The pointing and tracking are accomplished by a unique offset guide system which utilizes a star tracker and a star field camera mounted on two-axis offset gimbals, controlled by an on-board CPU. Details of BIRT's design and major results of its observations are presented. In addition, compilations are presented of the far-infrared line observations, far-infrared line parameters, and observational work of the spectral lines.
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