Last modified: December 2023

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AHELP for CIAO 4.16 Sherpa


Context: data


Load a RMF from a file and add it to the background of a PHA data set.


load_bkg_rmf(id, arg=None)

id - int or str, optional


Load in the RMF to the background of the given data set. It is only for use when there is only one background component, and one response, for the source. For multiple backgrounds or responses, use `load_rmf` .


Example 1

Use the contents of the file 'bkg.rmf' as the RMF for the background of the default data set.

>>> load_bkg_rmf('bkg.rmf')

Example 2

Set 'core_bkg.rmf' as the RMF for the background of data set 'core':

>>> load_bkg_arf('core', 'core_bkg.rmf')


The parameters for this function are:

Parameter Definition
id The data set to use. If not given then the default identifier is used, as returned by `get_default_id` .
arg Identify the RMF: a file name, or a data structure representing the data to use, as used by the I/O backend in use by Sherpa: a rmfcratedataset for crates, as used by CIAO, or an AstroPy hdulist object.


The function does not follow the normal Python standards for parameter use, since it is designed for easy interactive use. When called with a single un-named argument, it is taken to be the `arg` parameter. If given two un-named arguments, then they are interpreted as the `id` and `arg` parameters, respectively. The remaining parameters are expected to be given as named arguments.

The `minimum_energy` setting of the `ogip` section of the Sherpa configuration file determines the behavior when an RMF with a minimum energy of 0 is read in. The default is to replace the 0 by the value 1e-10, which will also cause a warning message to be displayed.


See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.

See Also

dataspace1d, dataspace2d, datastack, fake, get_bkg, get_bkg_arf, get_bkg_model, get_bkg_rmf, get_bkg_source, get_rmf, load_arf, load_arrays, load_ascii, load_bkg, load_bkg_arf, load_data, load_grouping, load_image, load_multi_arfs, load_multi_rmfs, load_pha, load_quality, load_rmf, load_staterror, load_syserror, load_table, pack_image, pack_pha, pack_table, set_rmf, unpack_arf, unpack_arrays, unpack_ascii, unpack_bkg, unpack_data, unpack_image, unpack_pha, unpack_rmf, unpack_table
get_default_id, list_bkg_ids, list_data_ids, list_response_ids
add_model, add_user_pars, get_response, load_table_model, load_template_interpolator, load_template_model, load_user_model, save_model, save_source
save_arrays, save_data, save_delchi, save_error, save_filter, save_grouping, save_image, save_pha, save_quality, save_resid, save_staterror, save_syserror, save_table