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Дата изменения: Tue Sep 20 19:45:20 2011
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Calibration Access and Data Handbook
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Currently not used in the SAS, but may be in the future.
Is a placeholder that was supposed to have either some real background spectra
or some coefficients with which to generate background spectra.
It is currently not used, however might by used for a future
task that takes as input some proxies like the RA & Dec, the ROSAT broad
band count rates for the target location, the corner count rates etc.
and generates a best guess background file.
One extension containing calibrated event list of low background data, with
brighter point sources removed.
The CCF contains the following tables:
- PARTICLE :
- Accessed by :
- CAL_getParticleBackground(): Obtain background particle spectrum in PI channel
space according to the model :
- Attributes:
-
- EV_2_PI:
- eV per PI channel (unused)
- Columns:
-
- PAR:
- model parameters; two-row scalar columns
- X_RAY_DIFFUSE :
- Accessed by :
- Attributes:
-
- EV_2_PI:
- eV per PI channel (unused)
- Columns:
-
- FILTER_ID:
- meant to be the filter ID but contains currently an invalid
entry and is ignored by the CAL
- SPECTRUM:
- unmodulated PI background PI spectrum
- X_RAY_DIFFUSE_MODULATION :
- Accessed by :
- CAL_getDiffuseXBackground(): see above.
- Attributes:
- none.
- Columns:
-
- PAR:
- 3-row scalar column with modulation parameters (see above).
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Michael Smith
2011-09-20