An Imaging Photon Counting Intensified CCD for High Speed Photometry

Astronomy and Astrophysics – Astronomy

Scientific paper

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High Speed Photometry, Iccd, Mcp, Photon Counting

Scientific paper

The scientific performance evaluation of a photon counting imaging system is presented. The detector is constituted by an ICCD camera with RbTe photocathode (optimized for UV radiation), and dedicated electronics for the acquisition and analysis of the events. For each photon event on the CCD, a real-time centroid calculation is performed, in order to reach spatial resolution down to 25 μm FWHM. The system has been tested using the 182 cm telescope of the Asiago Observatory. A standard stars field through U Johnson filter, and the Crab pulsar (PSR 0531+21) were observed. From the photometric data, relative magnitudes of the standard stars have been derived, showing a good linearity of the detector in the range of flux under consideration, as expected from previous laboratory measurements. The pulsar's data have been processed by FFT and epoch folding techniques to test the detector's timing performances in the highest resolution mode (4.512 ms). These observations show that a space resolved time analysis of periodic sources can be performed with 10^-7 s accuracy.

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