Time Dependent Trace Angles for theSTIS First Order Modes

Details Time Dependent Trace Angles for theSTIS First Order Modes Time Dependent Trace Angles for theSTIS First Order Modes

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007stis.rept....3d&link_type=abstract

Instrument Science Report STIS 2007-03, 28 pages

Physics

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

Scientific paper

Single rows in STIS rectified spectral images and spectral extractions made with smallextraction boxes are being analyzed in science programs where the highest obtainablespatial resolution is needed. Here we address a problem that has limited the accuracyof these data products: the spectral traces in the reference files often do not have thesame tilt as those in the science exposures. By analyzing data for the most commonlyused first order spectral modes, we have determined that the traces have been systematicallyrotating over time. We have delivered spectral trace reference files that apply thecalibrated rotation to the most commonly used modes. We have also produced a PyRAFroutine, MKTRACE, that measures the tilt of the trace in a science image and producesa corrected trace reference file for that image. Using corrected traces, we have analyzedthe flux calibration of L grating spectra extracted with small boxes. We find substantialerrors in the spectral shape of small-box extractions of G430L spectra due to uncalibratedsystematic wavelength-dependent variability of the point spread function, whichbecomes broader at long wavelengths as it becomes narrower at short wavelengths.

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