TG_FINDZO: Finding 0th Order Centroid Position
TG_FINDZO: New Algorithm for finding zeroth order positionTG_FINDZO is a new algorithm for detecting a centroid position of a zeroth order image of Chandra HETGS and LETGS by finding an intersection between grating arms and a data transfer streak.
The new routine is designed to handle the following cases:
It is often ideal to use this algorithm for detecting the position of a extremely bright source (e.g., X-ray binaries) in the HETGS (or LETGS) + ACIS-S configuration. When the source is faint and/or the HRC-S is used as a detector (hence the pile-up is not an issue), tgdetect is recommended for the zeroth order detection.
For more information, see the description of the tg_findzo algorithm.
This page was last updated Apr 12, 2007 by Bish K. Ishibashi. To comment on it or the material presented here, send email to email@example.com.