The ISO LWS high resolution spectral survey towards Sagittarius B2

Details The ISO LWS high resolution spectral survey towards Sagittarius B2 The ISO LWS high resolution spectral survey towards Sagittarius B2

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511..205p&link_type=abstract

Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age, held in Siguenza, Spain 24-27 June, 2002. Edited by

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The giant molecular cloud complex, Sagittarius B2, was observed in many separate observations with the ISO Long Wavelength Spectrometer. The high resolution Fabry-Pérot mode, L03, was used to undertake a full and unbiased spectral survey over the wavelength range 47-197 μm as part of the Guaranteed Time program. In addition to this, many narrow Fabry-Pérot scans (L04) were carried out at specific wavelengths and several medium resolution grating measurements (L01) were undertaken with various different pointings. These provide an extensive dataset in the archive for this important bright source.
The large dataset of Fabry-Pérot measurements has been used to investigate and improve calibration procedures and files for the LWS L03 mode. During each Fabry-Pérot observation, the instrument settings were optimised for a single detector only (the `prime' detector). Using improved calibration procedures, data from the other nine LWS detectors can now also be calibrated and used to improve the signal to noise and reliability of prime data.
These new data have allowed us to search for faint lines in the dataset and examine line shapes with much higher signal to noise. Results from this program so far include the modelling of atomic fine structure lines towards the source, observation of faint emission due to the HD J=1-->0 rotational line leading to an estimate of the deuterium abundance, and observation of OH lines containing the three stable isotopes of oxygen.

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