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Дата изменения: Mon Jul 9 05:54:32 2007
Дата индексирования: Sat Dec 22 14:01:04 2007
Кодировка:
Поисковые слова: galactic cluster

XMM-Newton Science Analysis System


omsrclistcomb (omsrclistcomb-2.7.1) [xmmsas_20070708_1801-7.1.0]

Meta Index / Home Page

Comments on Individual Table Columns

• RA - No correction has been made for the offset between the measured and true pointing direction.
• DEC - As above

• NB The next 2 columns will only be present if the parameter usecat has been set to true
• RA_CORR The corrected RAs computed by comparing the input RAs and Decs with the star-catalogue data
• DEC_CORR The corrected Decs computed by comparing the input RAs and Decs with the star-catalogue data NB if the keyword POSCORROK=f then the values in RA_CORR and DEC_CORR will be identical to those in RA and DEC

  LII and bII Galactic longitude and latitude computed from the RA_CORR and DEC_CORR columns.

• M_STD - The standard magnitudes computed for filter M using the allowed colour combinations - NB THE FILTERS FOR ALL COLOURS ARE THE XMM CODES LISTED EARLIER).

• 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