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public:user_software:documentation:makesourcedb [2022-04-29 11:51] – [Format string] Tammo Jan Dijkemapublic:user_software:documentation:makesourcedb [2022-10-21 14:25] (current) – Fix non logarithmic si definition Tammo Jan Dijkema
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 |OrientationIsAbsolute|boolean| |false|Whether the Orientation is absolute (w.r.t. declination axis) or relative (w.r.t. m axis in not-specified field). See the note below.| |OrientationIsAbsolute|boolean| |false|Whether the Orientation is absolute (w.r.t. declination axis) or relative (w.r.t. m axis in not-specified field). See the note below.|
 |IShapelet|string| | |Name of the ASCII file defining the shapelet coefficients and scale of the I flux in the 'Sarod' format. Note that field ''I'' gives the total flux, while ''IShapelet'' defines the shape.| |IShapelet|string| | |Name of the ASCII file defining the shapelet coefficients and scale of the I flux in the 'Sarod' format. Note that field ''I'' gives the total flux, while ''IShapelet'' defines the shape.|
-|QShapelet|string| |_ckgedit_QUOT__ckgedit> | Idem for Q flux. An empty name means that no Q flux is present. Note that the Q (and U) flux can still be given using RotationMeasure. | UShapelet | string | _ckgedit_QUOT__ckgedit>|Idem for U flux.| +|QShapelet|string| | |Idem for Q flux. An empty name means that no Q flux is present. Note that the Q (and U) flux can still be given using RotationMeasure.| 
-|VShapelet|string| |""|Idem for V flux.|+|UShapelet|string| | |Idem for U flux.| 
 +|VShapelet|string| | |Idem for V flux.|
 |SpectralIndex|doubles| |[]|Spectral index. Multiple values can be given enclosed in square brackets and separated by commas. The n-th value defines the n-th order term. \\ Note that the old way of specifying the spectral index (using SpectralIndexDegree and SpectralIndex:i) is not supported anymore. If used, an error is given.| |SpectralIndex|doubles| |[]|Spectral index. Multiple values can be given enclosed in square brackets and separated by commas. The n-th value defines the n-th order term. \\ Note that the old way of specifying the spectral index (using SpectralIndexDegree and SpectralIndex:i) is not supported anymore. If used, an error is given.|
 +|LogarithmicSI|bool| true |Determines the meaning of the spectral index. See Logarithmic SI below|
 |ReferenceFrequency|double|Hz| |Reference frequency (in Hz) for the spectral index| |ReferenceFrequency|double|Hz| |Reference frequency (in Hz) for the spectral index|
 |RotationMeasure|double|rad/m<nowiki>^</nowiki>2| |Rotation measure for the polarized flux Q and U| |RotationMeasure|double|rad/m<nowiki>^</nowiki>2| |Rotation measure for the polarized flux Q and U|
 |PolarizationAngle|double|rad|0|Polarization angle (in radians) for the polarized flux| |PolarizationAngle|double|rad|0|Polarization angle (in radians) for the polarized flux|
 |PolarizedFraction|double| |0|Fraction of I that is polarized| |PolarizedFraction|double| |0|Fraction of I that is polarized|
-|ReferenceWavelength|double|m|c/ReferenceFrequency|Reference wavelength (in m) if RM is specified using Q and U|+|ReferenceWavelength|double|m||Reference wavelength (in m) if RM is specified using Q and U|
 |Category|integer| |2|Source category (must be 1, 2, or 3)| |Category|integer| |2|Source category (must be 1, 2, or 3)|
 |Patch|string| | |Patch name| |Patch|string| | |Patch name|
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 Note that the polarized flux can be given directly (as Q and U) or by means of the rotation measure, polarization angle, and polarized fraction. An error is given if both are given for the same source. Note that the polarized flux can be given directly (as Q and U) or by means of the rotation measure, polarization angle, and polarized fraction. An error is given if both are given for the same source.
 +
 +=== Logarithmic Spectral Index ===
 +If ''LogarithmicSI'' is ''true'' (the default), the source intensity 'I' is computed as 
 +
 +''I = I0 * (v/v0) ^ (c0 + c1 * log10(v/v0) + c2 * log10(v/v0)^2 + ...)'', where 'v' is the frequency and 'v0' is the reference frequency.
 +
 +If ''LogarithmicSI'' is ''false'', the spectral index is interpreted in a way compatible with wsclean, namely as 
 +
 +''I = I0 + c0 * (v/v0 - 1) + c1 * (v /v0 - 1)^2 + c2 * (v/v0 -1)^3 + ...''
 +
 +This definition is also described in the [[https://wsclean.readthedocs.io/en/latest/component_list.html|WSClean documentation]].
  
 === Using Rotation Measure === === Using Rotation Measure ===
  • Last modified: 2022-04-29 11:51
  • by Tammo Jan Dijkema