SourceSpectrum¶

class synphot.spectrum.SourceSpectrum(modelclass, z=0, z_type='wavelength_only', **kwargs)[source]¶

Class to handle source spectrum.

Parameters:

modelclass, kwargs

See BaseSpectrum.

z : number

Redshift to apply to model.

z_type : {‘wavelength_only’, ‘conserve_flux’}

Redshift can be done in one of the following ways:

'wavelength_only' only shifts the wavelength without adjusting the flux. This is the default behavior to be backward compatible with ASTROLIB PYSYNPHOT.
'conserve_flux' also scales the flux to conserve it.

Attributes Summary

`model`	Model of the spectrum with given redshift.
`z`	Redshift of the source spectrum.
`z_type`	Redshift behavior.

Methods Summary

`from_file`(filename[, keep_neg])	Create a spectrum from file.
`from_vega`(**kwargs)	Load Vega spectrum.
`plot`([wavelengths, flux_unit, area, vegaspec])	Plot the spectrum.
`to_fits`(filename[, wavelengths, flux_unit, …])	Write the spectrum to a FITS file.

Attributes Documentation

Methods Documentation

classmethod from_file(filename, keep_neg=False, **kwargs)[source]¶

Create a spectrum from file.

If filename has ‘fits’ or ‘fit’ suffix, it is read as FITS. Otherwise, it is read as ASCII.

Parameters:	filename : str Spectrum filename. keep_neg : bool See `Empirical1D`. kwargs : dict Keywords acceptable by `read_fits_spec()` (if FITS) or `read_ascii_spec()` (if ASCII).
Returns:	sp : `SourceSpectrum` Empirical spectrum.

classmethod from_vega(**kwargs)[source]¶

Parameters:	kwargs : dict Keywords acceptable by `read_remote_spec()`.
Returns:	vegaspec : `SourceSpectrum` Empirical Vega spectrum.

plot(wavelengths=None, flux_unit=None, area=None, vegaspec=None, **kwargs)[source]¶

Plot the spectrum.

Note

Uses matplotlib.

Parameters:	wavelengths : array-like, `Quantity`, or `None` Wavelength values for integration. If not a Quantity, assumed to be in Angstrom. If `None`, `self.waveset` is used. flux_unit : str or `Unit` or `None` Flux is converted to this unit for plotting. If not given, internal unit is used. area, vegaspec See `convert_flux()`. kwargs : dict See `BaseSpectrum.plot()`.
Raises:	synphot.exceptions.SynphotError Invalid inputs.

to_fits(filename, wavelengths=None, flux_unit=None, area=None, vegaspec=None, **kwargs)[source]¶

Write the spectrum to a FITS file.

Parameters:

filename : str: Output filename.
wavelengths : array-like, Quantity, or None: Wavelength values for sampling. If not a Quantity, assumed to be in Angstrom. If None, self.waveset is used.
flux_unit : str or Unit or None: Flux is converted to this unit before written out. If not given, internal unit is used.
area, vegaspec: See convert_flux().
kwargs : dict: Keywords accepted by write_fits_spec().