XMM-Newton Science Analysis System


esources (esources-1.5.2) [22.0.0-9173c7d25-20250127]

Source inclusion criteria

Criteria for inclusion of a source in the output list are as follows:

• The maximum value of the source ID number is limited by the number of characters allocated to hexadecimal source ID numbers (parameter numhexchar). The source ID number is a hexadecimal version of the SRC_NUM column.
• No source is considered for which the ii_CTS value is null for all three EPIC instruments.
• Sources are included only if a weighted sum $C$ of the ii_CTS values $c_i$ exceeds mintotalcts. The weight formula is
    $$C = \frac{\sum_{i=1}^{3} \delta_i \ c_i}{\sum_{i=1}^{3} \delta_i \ w_i}$$ (1)

  where the index $i$ runs over the three EPIC instruments, $\delta_i$ equals 0 if $c_i$ is a null value but 1 otherwise, and $w_i$ is a normalized weight associated with the instrument.

• ii_DET_ML must be $>$ mindetml and ii_MASKFRAC must be $>$ minmaskfrac for at least one of the instruments ii.
• The calculated width of the time bins must be $>0$.