# create_rmf¶

sherpa.astro.ui.create_rmf(rmflo, rmfhi, startchan=1, e_min=None, e_max=None, ethresh=None, fname=None, name='delta-rmf') [edit on github]

Create an RMF.

If fname is set to None then this creats a “perfect” RMF, which has a delta-function response (so each channel uniquely maps to a single energy bin), otherwise the RMF is taken from the image data stored in the file pointed to by fname.

New in version 4.10.1.

Parameters
• rmflo (array) – The energy bins (low and high, in keV) for the RMF. It is assumed that emfhi_i > rmflo_i, rmflo_j > 0, that the energy bins are either ascending, so rmflo_i+1 > rmflo_i or descending (rmflo_i+1 < rmflo_i), and that there are no overlaps. These correspond to the Elow and Ehigh columns (represented by the ENERG_LO and ENERG_HI columns of the MATRIX block) of the OGIP standard.

• rmfhi (array) – The energy bins (low and high, in keV) for the RMF. It is assumed that emfhi_i > rmflo_i, rmflo_j > 0, that the energy bins are either ascending, so rmflo_i+1 > rmflo_i or descending (rmflo_i+1 < rmflo_i), and that there are no overlaps. These correspond to the Elow and Ehigh columns (represented by the ENERG_LO and ENERG_HI columns of the MATRIX block) of the OGIP standard.

• startchan (int, optional) – The starting channel number: expected to be 0 or 1 but this is not enforced.

• e_min (None or array, optional) – The E_MIN and E_MAX columns of the EBOUNDS block of the RMF.

• e_max (None or array, optional) – The E_MIN and E_MAX columns of the EBOUNDS block of the RMF.

• ethresh (number or None, optional) – Passed through to the DataRMF call. It controls whether zero-energy bins are replaced.

• fname (None or str, optional) – If None then a “perfect” RMF is generated, otherwise it gives the name of the two-dimensional image file which stores the response information (the format of this file matches that created by the CIAO tool rmfimg 1).

• name (str, optional) – The name of the RMF data set

Returns

rmf

Return type

DataRMF instance

References

1

http://cxc.harvard.edu/ciao/ahelp/rmfimg.html