L. Haser

New Wavelength Determinations of Mid-Infrared Fine-structure Lines by Infrared Space Observatory Short Wavelength Spectrometer

We report accurate new wavelengths for 29 mid-infrared ionic fine-structure lines, based on observations with the Short Wavelength Spectrometer (SWS) on board the Infrared Space Observatory (ISO). Our results originate from observations of NGC 7027, NGC 6543, NGC 6302, the Circinus galaxy, Sgr A West, and W51 IRS 2. The obtained accuracies (λ/Δλ) range from 3 × 104 to 1 × 105, depending on instrumental mode and uncertainty in radial velocities.

The short wavelength spectrometer for iso

The Short Wavelength Spectrometer (SWS) being developed for the Infrared Space Observatory (ISO) is described. The instrument is a pair of grating spectrometers, used in low orders, that will provide resolving powers of about 1000 from 3 μm to 45 μm. In combination with Fabry Perot etalons, the resolving power will be as high as 30,000 over the 15 to 30 μm range.

Experiences with cryogenic short-wavelength spectrometer for Infrared Space Observatory☆

Abstract The short-wavelength spectrometer for the Infrared Space Observatory (ISO) is a cryogenic instrument operating at wavelengths from 2.45 to 45 μm, containing a grating spectrometer and a scanning Fabry-Perot interferometer. Some of the techniques used to build and test the instrument are described and some test results are presented, all from the viewpoint of cryoengineering.

Detection of Thermal Water Vapor Emission from W Hydrae

We have detected four far-infrared emission lines of water vapor toward the evolved star W Hydrae, using the Short Wavelength Spectrometer (SWS) of the Infrared Space Observatory (ISO). This is the first detection of thermal water vapor emission from a circumstellar outflow.

Design and measured performance of the ISO short-wavelenght spetrometer

The Short Wavelength Spectrometer is one of the four instruments for the Infrared Space Observatory. The instrument operates at about 3 K. Employing diffraction gratings, if offers a resolving power between 1000 and 2000 in the wavelength range 2.45 to 45 micrometers . An additional Fabry-Perot interferometer offers resolutions between 25,000 and 30,000 in the range 12 to 45 micrometers . The instrument employs arrays of discrete detectors: InSb photo- diodes and Si:Ga, Si:Sb and Ge:Be photo-conductors. In the course of 1992, the flight unit was tested and characterized, with interruptions for minor modifications. The paper discusses the SWS design and its performance.

Testing and characterization of the short-wavelength spectrometer for Infrared Space Observatory

Results of the ground test and characterization program show that the performance of the SWS is well within its specifications. The procedures for ground testing and calibration are tuned to achieve commonality with in-orbit procedures. This strategy optimizes the development of data analysis procedures and allows a fast in-orbit check-out and update of the calibration.

Testing and characterization of the short wavelength spectrometer for ISO

Results of the ground test and characterization program show that the performance of the SWS is well within its specifications. The procedures for ground testing and calibration are tuned to achieve commonality with in-orbit procedures. This strategy optimizes the development of data analysis procedures and allows a fast in-orbit check-out and update of the calibration.