pipeline.domain.fluxmeasurement.FluxMeasurement

class FluxMeasurement(spw_id: int | str, I: int | float | FluxDensity, Q: int | float | FluxDensity = FluxDensity(0, FluxDensityUnits.JANSKY), U: int | float | FluxDensity = FluxDensity(0, FluxDensityUnits.JANSKY), V: int | float | FluxDensity = FluxDensity(0, FluxDensityUnits.JANSKY), spix: Decimal = Decimal('0.0'), uvmin: Decimal = Decimal('0.0'), uvmax: Decimal = Decimal('0.0'), origin: str | None = None, age: str | None = None, queried_at: str | None = None)[source]

Bases: object

FluxMeasurement is a logical representation of a flux measurement.

spw_id

ID of spectral window associated with flux measurement.

I

Stokes I flux density as FluxDensity object.

Q

Stokes Q flux density as FluxDensity object.

U

Stokes U flux density as FluxDensity object.

V

Stokes V flux density as FluxDensity object.

spix

Spectral index of the flux measurement.

uvmin

Scale (in klambda) of the measured (large scale) extent of the flux source (if greater than zero).

uvmax

Scale (in klambda) where (small scale) structure has been measured within the flux source, or a limit on the resolved structure.

origin

Origin of the flux measurement.

age

Age of the flux measurement.

queried_at

Date-timestamp when flux measurement was queried (e.g. from catalog service).

Methods

Attributes

casa_flux_density

Return list of Stokes I, Q, U, and V flux densities in Jansky.
__init__(spw_id: int | str, I: int | float | FluxDensity, Q: int | float | FluxDensity = FluxDensity(0, FluxDensityUnits.JANSKY), U: int | float | FluxDensity = FluxDensity(0, FluxDensityUnits.JANSKY), V: int | float | FluxDensity = FluxDensity(0, FluxDensityUnits.JANSKY), spix: Decimal = Decimal('0.0'), uvmin: Decimal = Decimal('0.0'), uvmax: Decimal = Decimal('0.0'), origin: str | None = None, age: str | None = None, queried_at: str | None = None) → None[source]

Initialize a FluxMeasurement object.

uvmin and uvmax are properties in the calibrator source catalog, see e.g. https://almascience.nrao.edu/alma-data/calibrator-catalogue.

Parameters:

  • spw_id -- ID of spectral window associated with flux measurement, as integer or string representation of integer.

  • I -- Stokes I flux density, either as int/float (assumed to be flux density in Jansky) or a FluxDensity object.

  • Q -- Stokes Q flux density, either as int/float (assumed to be flux density in Jansky) or a FluxDensity object; optional, defaults to 0 Jansky.

  • U -- Stokes U flux density, either as int/float (assumed to be flux density in Jansky) or a FluxDensity object; optional, defaults to 0 Jansky.

  • V -- Stokes V flux density, either as int/float (assumed to be flux density in Jansky) or a FluxDensity object; optional, defaults to 0 Jansky.

  • spix -- Spectral index of the flux measurement; optional, defaults to 0.

  • uvmin -- Scale (in klambda) of the measured (large scale) extent of the flux source (if greater than zero); optional, defaults to 0.

  • uvmax -- Scale (in klambda) where (small scale) structure has been measured within the flux source, or a limit on the resolved structure; optional, defaults to 0.

  • origin -- Origin of the flux measurement; optional, defaults to None.

  • age -- Age of the flux measurement; optional, defaults to None.

  • queried_at -- Date-timestamp when flux measurement was queried (e.g. from catalog service); optional, defaults to None.

property casa_flux_density: list[float]

Return list of Stokes I, Q, U, and V flux densities in Jansky.