XMM-Newton Science Analysis System


omdetect (omdetect-5.41) [22.0.0-9173c7d25-20250127]

Source classification

A source is classified as either “point-like” or “extended” by comparing its computed semi-major axis with that of the point-spread function, both having been computed using moments. A source is “extended” if the difference between its semi-major axis and that of the PSF is greater than 3 times the error in the semi-major axis of the source, otherwise it is classified as “point-like”.