Calibration Access and Data Handbook

Description

Tables with energy-/position- and pattern-dependent quantum efficiencies; CCD number s encoded in the table name; pattern number is encoded in column name (QE_0, QE_1, etc.); position information is given in column REGION

Keywords to describe the contents of the CCF:

The CCF contains the following tables:

QE_CCDn:

The quantum efficiency (QE) of the MOS detectors is given, per CCD, in the extensions QE_CCDn (where n=1 (central CCD) to 7). It is described as a function of event pattern type in columns QE_nn (where nn=0, single pixel events, - 31). The energy grid for these arrays in given in the extension EBINS. These extensions also hold keywords to describe the ratio of the events which have patterns 13-25 to those which have larger pattern numbers (available as MISCDATA). Keywords are also present which allow the average size of the large patterns to be calculated as a function of photon energy.

Attributes:

LRG_1325:

Ratio of large events to Pattern 13-25 events

LRG_SIZ0:

Coefficient 0 for calculation of average large pattern size

LRG_SIZ1:

Coefficient 1

LRG_SIZ2:

Coefficient 2

LRG_SIZ3:

Coefficient 3

LRG_SIZ4:

Coefficient 4

Columns:

REGION:

A spatial region to allow intra-chip QE to be expressed.

QE_nn:

The QE per pattern.

EBINS:

The energy grid for the QE_CCDn arrays.

Attributes:

None.

Columns:

ENERGY:

Photon energy (eV).

QE_TOTAL:

The total QE as a function of energy.

Attributes:

None.

Columns:

QE_TOTAL:

Total QE.

FRACTION_CHANNEL

The fraction of the total QE which is contained in single, double, triple or quadruple pixel events, as a function of the channels tabulated in CHBINS_FRACTION.

Attributes:

None.

Columns:

MODE_ID:

The observing modes

THRESH:

The threshold at which events are cut-off in channels.

REGION:

A spatial selection

FRAC_S:

The fraction contained in single pixels

FRAC_D:

The fraction contained in double-pixel events

FRAC_T:

The fraction contained in triples

FRAC_Q:

The fraction contained in quadruple-pixel events

FRAC_SD:

The fraction contained in single+double pixel events

FRAC_SDTQ:

The fraction contained in single+double+triple+quads

FRACTION_ENERGY

The fraction of the total QE which is contained in single, double, triple or quadruple pixel events, as a function of the energies tabulated in EBINS_FRACTION.

The effective area file generator, arfgen, calculates the detector QE by multiplying QE_TOTAL by FRACTION_ENERGY.

Attributes:

None.

Columns:

MODE_ID:

The observing modes

THRESH:

The threshold at which events are cut-off in channels.

REGION:

A spatial selection

FRAC_S:

The fraction contained in single pixels in energy space

FRAC_D:

The fraction contained in double-pixel events

FRAC_T:

The fraction contained in triples

FRAC_Q:

The fraction contained in quadruple-pixel events

FRAC_SD:

The fraction contained in single+double pixel events

FRAC_SDTQ:

The fraction contained in single+double+triple+quads

EBINS_FRACTION

The energy grid for the FRACTION_ENERGY arrays.

Attributes:

None.

Columns:

ENERGY:

Photon energy (eV).

CHBINS_FRACTION

The channel grid for the FRACTION_CHANNEL arrays.

Attributes:

None.

Columns:

PI_CHAN:

PI channel number (channels).