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Session 18 - STIS.
Display session, Wednesday, January 07
Exhibit Hall,

[18.12] Spectroscopic Mode Image Quality of STIS

K. C. Sahu, S. J. Hulbert, H. H. Lanning, J. A. Christensen (STScI)

The spectroscopic mode image quality of STIS as determined from the on- orbit observations during SMOV will be presented. Calibration spectra were obtained by taking internal line lamp exposures using an appropriately long, 2 pixel wide slit. The measurements were done with 7 first-order gratings which were used to extract instrumental line profiles at different positions of the CCD and the MAMA detectors. The line-widths measured at different positions of the detectors for different gratings were found to be close to 2 pixels for all modes. Deep exposures were taken to check for extended wings of the lines and to ensure a complete field coverage for the lines. The actual line profiles, line-widths and the encircled energies as a function of the number of pixels, along with the details of the procedure adapted for the wavelength calibration will be presented.

Program listing for Wednesday