Chandra ACIS Sub-pixel Resolution

Details Chandra ACIS Sub-pixel Resolution Chandra ACIS Sub-pixel Resolution

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21822830k&link_type=abstract

American Astronomical Society, AAS Meeting #218, #228.30; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We investigate how to achieve the best possible ACIS spatial resolution by binning in ACIS sub-pixel and applying an event repositioning algorithm after removing pixel-randomization from the pipeline data. We quantitatively assess the improvement in spatial resolution by (1) measuring point source sizes and (2) detecting faint point sources. The size of a bright (but no pile-up), on-axis point source can be reduced by about 20-30%. With the improve resolution, we detect 20% more faint sources when embedded on the extended, diffuse emission in a crowded field. We further discuss the false source rate of about 10% among the newly detected sources, using a few ultra-deep observations. We also find that the new algorithm does not introduce a grid structure by an aliasing effect for dithered observations and does not worsen the positional accuracy

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