scopesim_templates.misc.misc.source_from_imagehdu

scopesim_templates.misc.misc.source_from_imagehdu#

scopesim_templates.misc.misc.source_from_imagehdu(image_hdu, filter_name, pixel_unit_amplitude=None, waverange=None, inst_pkg_path=None) → Source#

Create a scopesim.Source object directly from a fits.ImageHDU.

Parameters:

  • image_hdu (fits.ImageHDU)

  • filter_name (Path | str) – Either a standard filter name or a filter from an instrument package

  • waverange (tuple) – wave_min and wave_max of the spectral range

  • pixel_unit_amplitude – A Quantity that corresponds to a pixel value of 1 in the image If not given, header keyword BUNIT is used

  • optional – A Quantity that corresponds to a pixel value of 1 in the image If not given, header keyword BUNIT is used

  • inst_pkg_path (str, optional) – Not yet implemented

Returns:

src

Return type:

scopesim.Source

Examples

Using a generic filter curve from the Spanish VO:

>>> from scopesim_templates.misc import misc
>>> image_hdu = fits.ImageHDU(

… data=np.ones((11, 11)), … header=fits.Header({ … “CUNIT1”: “deg”, … “CUNIT2”: “deg”, … “CDELT1”: 0.001, … “CDELT2”: 0.001, … })) >>> # add WCS info to the header here >>> filter_name = “Generic/Johnson_UBVRIJHKL.N” >>> src = misc.source_from_imagehdu(image_hdu=image_hdu, … filter_name=filter_name, … pixel_unit_amplitude=20*u.Jy)

Using the METIS H2O-ice filter from the METIS ScopeSim package:

>>> import scopesim
>>> _ = scopesim.download_packages(["METIS"])
>>> filter_name = scopesim.rc.__search_path__[0] / \

… “METIS/filters/TC_filter_H2O-ice.dat” >>> src = misc.source_from_imagehdu(image_hdu=image_hdu, … filter_name=filter_name, … pixel_unit_amplitude=20*u.Jy)

Todo

Check if the image_hdu has WCS

Contents