SOURCE_PARAMETER Source parameter information.

Name

Format

Units

Measure

Comments

Columns

Key

SOURCE_PARAMETER_ID

Int Source parameter identifier

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 densities

SOURCE_FLUX_ERR

Float( Nsto, Nfpt) Jy Flux density uncertainties

FREQUENCY

Double( Nfpt) Hz Frequencies for these flux densities

FREQ_INTERVAL

Double( Nfpt) Hz Frequencies interval over which flux densities are measured

(SOURCE_SIZE)

Float(2, Nfpt) arcsec Sizes along major and minor axis

(SOURCE_SIZE_ERR)

Float(2, Nfpt) arcsec Size uncertainties along major and minor axis

(SOURCE_PA)

Float( Nfpt) rad Position angle major axis

(SOURCE_PA_ERR)

Float( Nfpt) rad Uncertainties of the major axis PAs

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, eventually a temporal series, in the SOURCE table.
SOURCE_PARAMETER_ID
Source parameter identifier
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_FLUX_ERR
Source flux uncertainties
FREQUENCY
Frequency for these flux densities.
FREQ_INTERVAL
Frequency for these flux densities.
SOURCE_SIZE
Source size (would negative values be acceptable to tell they are only upper limits?)
SOURCE_SIZE_ERR
Source size uncertaintiies
SOURCE_PA
Position angle of major axis
SOURCE_PA_ERR
Major axis Position Angle uncertainties
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.