astromodels.sources.point_source module

class astromodels.sources.point_source.PointSource(source_name: str, ra: Optional[float] = None, dec: Optional[float] = None, spectral_shape: Optional[Function1D] = None, l: Optional[float] = None, b: Optional[float] = None, components=None, sky_position: Optional[SkyDirection] = None, polarization=None)

Bases: Source, Node

A point source. You can instance this class in many ways.

• with Equatorial position and a function as spectrum (the component will be automatically called ‘main’):

  >>> from astromodels import *
  >>> point_source = PointSource('my_source', 125.6, -75.3, Powerlaw())
  

• with Galactic position and a function as spectrum (the component will be automatically called ‘main’):

  >>> point_source = PointSource('my_source', l=15.67, b=80.75, spectral_shape=Powerlaw())
  

• with Equatorial position or Galactic position and a list of spectral components:

  >>> c1 = SpectralComponent("component1", Powerlaw())
  >>> c2 = SpectralComponent("component2", Powerlaw())
  >>> point_source = PointSource("test_source",125.6, -75.3,components=[c1,c2])
  
  Or with Galactic position:
  
  >>> point_source = PointSource("test_source",l=15.67, b=80.75,components=[c1,c2])
  

NOTE: by default the position of the source is fixed (i.e., its positional parameters are fixed)

Parameters:

• source_name – name for the source

• ra – Equatorial J2000 Right Ascension (ICRS)

• dec – Equatorial J2000 Declination (ICRS)

• spectral_shape – a 1d function representing the spectral shape of the source

• l – Galactic latitude

• b – Galactic longitude

• components – list of spectral components (instances of SpectralComponent)

• sky_position – an instance of SkyDirection

Returns:

property free_parameters: Dict[str, Parameter]

Returns a dictionary of free parameters for this source. We use the parameter path as the key because it’s guaranteed to be unique, unlike the parameter name.

Returns:

property has_free_parameters: bool

Returns True or False whether there is any parameter in this source

Returns:

property parameters: Dict[str, Parameter]

Returns a dictionary of all parameters for this source. We use the parameter path as the key because it’s guaranteed to be unique, unlike the parameter name.

Returns: