2-D Algorithm for Removing Scattered Light from STIS Echelle Data

Details 2-D Algorithm for Removing Scattered Light from STIS Echelle Data 2-D Algorithm for Removing Scattered Light from STIS Echelle Data

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002stis.rept....1v&link_type=abstract

Instrument Science Report STIS 2002-001, 14 pages

Computer Science

Performance

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

Scientific paper

Using the cores of saturated interstellar absorption lines, we demonstrate that a twodimensional model of scattered light should be used when extracting STIS echelle spectra, particularly in the FUV where echelle grating scatter is significant. We describe the 2-D scattered light model of Lindler & Bowers, which includes the effects of echelle grating scatter, detector halo, telescope PSF, cross-disperser scatter, and ghosts. We also describe the algorithm developed by Lindler & Bowers to remove scattered light from STIS images by iteratively constructing a scattered light estimate from the extracted spectrum. Finally, we describe the implementation and performance of the Lindler & Bowers algorithm in the IRAF task x1d, which is part of the calstis spectral extraction package.

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