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XMM-Newton Science Analysis System


omsource (omsource-1.15.5) [xmmsas_20070708_1801-7.1.0]

Meta Index / Home Page / Photometry Methods

Aperture Photometry on FAST mode data

Aperture photometry is conducted in a similar fashion to that for the Imaging mode. Because of the very small window, an IMAGING mode window containing the source can be used, through the parameter backgroundimageset, to obtain the background. In this case the source counts will be extracted using the image, whilst the background will be obtained using an annulus centred on the source in the background image.

The aperture radius can be changed between 6 and 12 pixels. The upper limit corresponds to the cal calibration radius. Using a smaller radius than the upper limit will result in the source counts being scaled to the calibration radius using the point-spread function (this correction is the tabulated psf1 corr value).