Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-04-25
Astron.Astrophys. 388 (2002) L44
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, accepted by A&A
Scientific paper
10.1051/0004-6361:20020630
The giant molecular cloud Sagittarius B2, located near the Galactic Centre, has been observed in the far-infrared by the ISO Long Wavelength Spectrometer. Wavelengths in the range 47-196 microns were covered with the high resolution Fabry-Perot spectrometer, giving a spectral resolution of 30-40 km/s. The J=1-0 and J=2-1 rotational transitions of HD fall within this range at 112 microns and 56 microns. A probable detection was made of the ground state J=1-0 line in emission but the J=2-1 line was not detected above the noise. This allowed us to calculate an upper limit on the temperature in the emitting region of approximately 80 K and a value for the deuterium abundance in the Sgr B2 envelope of D/H=(0.2-11)x10^-6.
Baluteau Jean-Paul
Caux Emmanuel
Ceccarelli Cecilia
Polehampton Edward T.
Swinyard Bruce M.
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