Updated Chandra LETG Higher Order Diffraction Efficiencies

Details Updated Chandra LETG Higher Order Diffraction Efficiencies Updated Chandra LETG Higher Order Diffraction Efficiencies

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3603w&link_type=abstract

American Astronomical Society, HEAD meeting #12, #36.03

Astronomy and Astrophysics

Astronomy

Scientific paper

Using LETG/ACIS-S spectra from six observations of bright continuum sources, relative grating efficiencies (normalized to 1st order) were measured for m = 2 to 10 for mλ < 80 [[Unable to Display Character: Ǻ]]. In the worst case, near 12 [[Unable to Display Character: Ǻ]], measured efficiencies were found to be 15-20% smaller than determined in the previous calibration for orders m = 3-6, with most orders' efficiencies at least slightly smaller than previous values over most of the measured wavelength range. Calibration uncertainties short of 6 [[Unable to Display Character: Ǻ]] are greater than 10% because of a paucity of counts and systematic uncertainties in the large pile-up corrections, but uncertainties (relative to 1st order) for the new grating efficiencies (N0007) are estimated to be 5-10% (best for 3rd order and generally increasing with larger m) over the calibration range. Errors are unknown but presumably larger for mλ > roughly 80 [[Unable to Display Character: Ǻ]] and for orders beyond m=10.

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