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XMM-Newton Science Analysis System


omsrclistcomb (omsrclistcomb-2.11.4) [xmmsas_20080701_1801-8.0.0]

Meta Index / Home Page

Notes on the Source Flags

• QUALITY FLAGS Each source has an associated ``quality flag''. The flag settings are:

• Bit set integer value reason
• 0 1 Source lies above one or more bad pixels
• 1 2 Source may be affected by a read-out streak
• 2 4 Source may be affected by a smoke-ring
• 3 8 Source may be affected by a star diffraction spike
• 4 16 Very bright source with a strong modula 8 pattern )
• 5 32 Source lies within central enhanced region
• 6 64 Source lies near to another bright source
• 7 128 Source lies near to an edge of the image
• 8 256 Point source lies partly or totally within an extended region
• 9 512 Very compact source/highly unusual

• For example, a source with a bad pixel and lying on or close to a read-out streak would have bits 0 and 1 set and thus have a quality flag of 3.

• QFLAG The quality flag for each source in each filter obtained from the input source-lists.

• QFLAG_COMB The quality flag for each source in each filter obtained using the combined source-list.

• CONFUSION FLAGS Each source has an associated ``confusion flag''. The flag settings are:
• Bit set integer value reason
• 0 1 Point source has one or more sources within a radius of 6-12 unbinned pixels
• 1 2 Point source has one or more sources within a radius of 3-6 unbinned pixels