Spectroscopic Mode Image Quality of STIS I. First Order Modes

Details Spectroscopic Mode Image Quality of STIS I. First Order Modes Spectroscopic Mode Image Quality of STIS I. First Order Modes

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stis.rept....4s&link_type=abstract

Instrument Science Report STIS 98-04, 16 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph

Scientific paper

This ISR reports the spectroscopic mode image quality of STIS first-order modes as determined from the on-orbit observations as part of the cycle-7 calibration program. Calibration spectra with an internal lamp were obtained for 7 first-order gratings using a narrow (2-pixel wide) slit, and 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, are presented graphically, and are found to be close to 2 pixels for all modes. The line profiles (shown in normal and log scales) are fairly well represented by a single Gaussian. The encircled energies are plotted as a function of the number of pixels, which show that most of the power is contained within ± 2 pixels of the line center.

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