Evaluating Sub-pixel-resolution Chandra Imaging from Split Event Repositioning: the Orion Nebula CLluster

Details Evaluating Sub-pixel-resolution Chandra Imaging from Split Event Repositioning: the Orion Nebula CLluster Evaluating Sub-pixel-resolution Chandra Imaging from Split Event Repositioning: the Orion Nebula CLluster

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.5906l&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #59.06; Bulletin of the American Astronomical Society, Vol. 34, p.741

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Direct measurement of the charge cloud sizes and shapes generated by X-ray photons in charge-coupled devices (CCDs) shows that the typical cloud size is about 1 micron (e.g., Tsunemi et al. 1999, Nucl. Instr. Method A, 436, 32). This means the landing positions of photons that generate split events are near pixel boundaries, not at the pixel centers. The pixel size of Chandra CCDs is 24 microns, so algorithms designed to refine the positions of split events should significantly improve the spatial resolution of Chandra CCD (ACIS) imaging (e.g., Tsunemi et al., 2001, AJ, 554, 496). We are using archival Chandra/ACIS data obtained for the Orion Nebula Cluster (ONC) to evaluate subpixel event repositioning algorithms. We analyze the improvement in image FWHM for ONC sources as a function of total source counts, off-axis angle, and split event percentage, so as to establish the degree of image improvement achieved by (as well as limitations on the success of) subpixel event repositioning. We also present results of subpixel repositioning algorithms as applied to extended sources, such as the compact planetary nebula BD +30 3639 and the X-ray jet from the quasar 3C 273.

Affiliated with

Also associated with

No associations

Rating

Evaluating Sub-pixel-resolution Chandra Imaging from Split Event Repositioning: the Orion Nebula CLluster does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Evaluating Sub-pixel-resolution Chandra Imaging from Split Event Repositioning: the Orion Nebula CLluster, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evaluating Sub-pixel-resolution Chandra Imaging from Split Event Repositioning: the Orion Nebula CLluster will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1719426