Statistics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.1315n&link_type=abstract
American Astronomical Society, HEAD meeting #10, #13.15
Statistics
1
Scientific paper
Reprocessing of the Chandra archival data for the years 2000-2005 is nearly complete. A significant improvement in the processing for many of the grating observations is the more accurate position determination for the zeroth order, which results in more accurate wavelength assignments for the dispersed spectral data. We describe the ISIS software tool FINDZERO which uses the known angles between the readout streak and the HEG, MEG, and LEG spectral arms to locate the zeroth order. FINDZERO was used in the reprocessing to determine the zeroth order position for cases when the standard processing tools give a less accurate result, such as piled-up or instrumentally blocked sources. The newly reprocessed grating data is compared to the previous version of the data and examples of types of sources and methods used by the Validation and Verification Team for determining the zeroth order position are given. Statistics on the fraction of grating observations that will show significant improvement with the reprocessing and keys for the investigator to assess whether an observation is worth re-analysis are also given.
Huenemoerder Dave
ishibashi B. K.
Nichols Joy S.
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