Detection of HD in emission towards Sagittarius B2
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0204432,
title = {Detection of HD in emission towards Sagittarius B2},
author = {E. T. Polehampton and J. -P. Baluteau and C. Ceccarelli and B. M. Swinyard and E. Caux},
journal= {arXiv preprint arXiv:astro-ph/0204432},
year = {2009}
}
Comments
4 pages, 1 figure, accepted by A&A