Calibrating Pile-up in ACIS Imaging Data with PSRJ0437-4715

Physics

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Chandra Proposal Id #05508194

Scientific paper

To better calibratate pile-up in ACIS imaging data, we need a set of observations of a faint point source with different frame times. The calibration team has been given approval by the CXC director and project science to observe the isolated pulsar PSR J0437-4715 with 5 different frame times. The ACIS-S3 count rate of this source is 0.2 ct/s and the five frame times will produce pile-up fractions of <1%, 5%, 10%, 20% and approximately 35%. The 5 msec pulsations os this source will not have an impact on the measurements.

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