|
Name | Format | Units | Measure | Comments |
| | Columns |
| | Key |
TIME |
Double | s | EPOCH | Time
interval mid-point |
INTERVAL | Double | s |
| Time interval |
| | Data description |
NUM_FREQ | Int | |
| Number Nfpt of frequencies
to which parameters are
provided |
NUM_STOKES | Int |
| | Number of stokes
parameters Nsto |
NUM_DEP
| Int | | | Number Ndep of
dependencies for
bootstraped fluxes |
| | Data |
SOURCE_STOKES
| Int( Nsto) | | | Stokes
identification |
SOURCE_FLUX
| Float( Nsto, Nfpt) | Jy | | Flux
values |
SOURCE_SIZE |
Float(2, Nfpt) | arcsec | | Sizes
along major and minor
axis |
SOURCE_PA | Float(
Nfpt) | rad | | Position angle
major axis |
DEP_SOURCE_PAR_ID
| Int( Ndep) | rad | | Dependent
source identifier |
| |
|
Notes: This source parameter table provides informations for calibration sources. At the time of the
observations it is a priori information. Bootstraped fluxes are stored in this table as well. There is an
optional reference to an entry in this table in the SOURCE table.
-
TIME
- Time when the source parameters have been measured
INTERVAL - Interval over which the parameters are believed valid. If the degree of variability
of for the source is unknown, the attribute to that key would be set to 0.
-
NUM_FREQ
- Number of frequencies Nfpt for which the fluxes are provided
-
NUM_STOKES
- Number of stokes parameters Nsto with known fluxes
-
NUM_DEP
- Number of dependencies Ndep for bootstraped fluxes. NUM_DEP= Ndep=0 for primary
calibrators. The number of dependencies is internal i.e. must refer to results from data in
the AEDF data set itself.
-
SOURCE_STOKES
- List of stokes parameters (with the standard axis convention).
-
SOURCE_FLUX
- Source fluxes
-
SOURCE_SIZE
- Source size (would negative values be acceptable to tell they are only upper
limits?)
-
SOURCE_PA
- Position angle of major axis
-
DEP_SOURCE_PAR_ID
- List of identifiers for the dependencies. This list is not empty only
for bootstraped fluxes.
Remark:
During actual observations, TIME here in SOURCE_PARAMETER will indeed not belong to the time
INTERVAL of the SOURCE sub-table. This does not prevent to refine the calibration
subsequently by appending new rows in this SOURCE_PARAMETER sub-table and by
extending accordingly the list of SOURCE_PARAMETER_ID in the SOURCE table. Results
about bootstraped fluxes during the calibration stage would also be stored in this table. The
source size, or its upper limit, provides the information on valid baseline lengths in the
bootstrap.