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XMM-Newton Science Analysis System

omdetect (omdetect-5.41) [xmmsas_20211130_0941-20.0.0]


Comprehensive source-flagging was introduced into SAS 6.5 in 2005. Many of the flags are set by empirical nature and since they are based on a statistical sample of images they are not infallible to error in individual cases.

Here is a list of known shortcomings$\backslash $problems-

  1. Mod-8 pattern- occasionally a source that does not have any obvious mod-8 pattern around it gets flagged and vice versa.
  2. Source within central enhancement region Currently omdetect uses a circular region with a fixed radius to flag sources. This means that occasionally some sources will not get flagged when they are clearly affected by the central light, and some may get flagged unnecessarily.
  3. SOURCE ON STAR SPIKE Occasionally some sources may not be flagged when they clearly should be.

XMM-Newton SOC -- 2021-11-30