calc_theta
- acstools.polarization_tools.calc_theta(q, u, detector, pav3)
Calculate the position angle of the electric field vector given Stokes Q and U. For ACS, it is also necessary to supply the position angle of the V3 axis of the telescope (PA_V3 in the primary header) and the name of the ACS detector used.
- Parameters:
- qfloat
Stokes Q parameter.
- ufloat
Stokes U parameter.
- detector{‘wfc’, ‘hrc’}
Name of the ACS detector used for the observation. Must be either WFC or HRC.
- pav3float or
Quantity Position angle of the V3 axis in units of degrees. Found in ACS primary headers with keyword PA_V3.
- Returns:
- theta
Quantity Position angle of the electric field vector in degrees.
- theta