CurvedPowerLaw¶
- class pysm3.CurvedPowerLaw(map_I, freq_ref_I, map_pl_index, nside, spectral_curvature, freq_curve, max_nside=None, has_polarization=True, map_Q=None, map_U=None, freq_ref_P=None, unit_I=None, unit_Q=None, unit_U=None, map_dist=None)[source] [edit on github]¶
Bases:
PowerLaw
This function initialzes the power law model of synchrotron emission.
The initialization of this model consists of reading in emission templates from file, reading in spectral parameter maps from file.
- Parameters:
- map_I, map_Q, map_U: `pathlib.Path` object
Paths to the maps to be used as I, Q, U templates. If has_polarization is True and map_Q is None, assumes map_I is IQU
- unit_*string or Unit
Unit string or Unit object for all input FITS maps, if None, the input file should have a unit defined in the FITS header.
- freq_ref_I, freq_ref_P: Quantity or string
Reference frequencies at which the intensity and polarization templates are defined. They should be a astropy Quantity object or a string (e.g. “1500 MHz”) compatible with GHz.
- map_pl_index: `pathlib.Path` object
Path to the map to be used as the power law index.
- nside: int
Resolution parameter at which this model is to be calculated.
Methods Summary
get_emission
(freqs[, weights])This function evaluates the component model at a either a single frequency, an array of frequencies, or over a bandpass.
Methods Documentation
- get_emission(freqs: Unit('GHz'), weights=None)[source] [edit on github]¶
This function evaluates the component model at a either a single frequency, an array of frequencies, or over a bandpass.
- Parameters:
- freqs: scalar or array astropy.units.Quantity
Frequency at which the model should be evaluated, in a frequency which can be converted to GHz using astropy.units. If an array of frequencies is provided, integrate using trapz with a equal weighting, i.e. simulate a top-hat bandpass.
- weights: np.array, optional
Array of weights describing the frequency response of the instrument, i.e. the bandpass. Weights are normalized and applied in Jy/sr.
- Returns:
- outputastropy.units.Quantity
Simulated map at the given frequency or integrated over the given bandpass. The shape of the output is (3,npix) for polarized components, (1,npix) for temperature-only components. Output is in
uK_RJ
.