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A 2-D file-based ancillary response model. Alternate names
include FEXPMAP and FEXPMAP2D.
FARF2D is a file-based model whose primary use is
to represent 2-D exposure maps in arbitrary units (seconds,
cm^2, etc.).
Note the following about exposure maps:
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The exposure map image must be of the same size as the data
image, and it must have the same plate-scale (i.e., bins
in each image must have the same size in arc-seconds, etc.).
-
If an exposure map and a point-spread function (PSF) are to
be used in the same instrument stack, then the images containing both
must have the same plate-scale.
See the documentation on the
INSTRUMENT command.
See also the RSP2D
instrument model.
FARF2D Parameters
| 1 | file | exposure map file name |
| 2 | norm | normalization |
Input an exposure map for use with a dataset:
sherpa> DATA data/data.fits
sherpa> PARAMPROMPT OFF
Model parameter prompting is off
sherpa> FEXPMAP[emap]
sherpa> emap.file = "data/data_expmap.fits"
sherpa> INSTRUMENT = emap
In this example, the instrument model component FEXPMAP
is established, the exposure map file is input using this model's file
parameter, and the instrument model stack is set for dataset number 1.
The CIAO 2.3 equivalent of this command is:
sherpa> DATA data/data.fits
sherpa> PARAMPROMPT OFF
Model parameter prompting is off
sherpa> GRIDMODEL[gm]
sherpa> gm.file = "data/data_expmap.fits"
sherpa> EXPMAP 1 = gm
Use a point-spread function file in addition to an exposure
map:
sherpa> FEXPMAP[emap]
sherpa> emap.file = "data/data_expmap.fits"
sherpa> FPSF[psfunc]
sherpa> psfunc.file = "data/data_psf.fits"
sherpa> INSTRUMENT = emap*psfunc
This may also be done with the RSP2D
command:
sherpa> RSP2D[r]
sherpa> r.empfile = "data/data_expmap.fits"
sherpa> r.psffile = "data/data_psf.fits"
sherpa> INSTRUMENT = r
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