This task combines the images produced for individual observations
into larger field mosaics. This includes the event and exposure
images (output from mosspectra), QPB background images (output
from mosback processed by rotdet2sky), and the soft proton
images (output from proton also processed by rotdet2sky).
Pixel size, coordinate system, and central coordinates are all user
selected. The output images are
pixels.
mosaicmerge compensates for the inclusion of observations with
different filters in the mosaic. It uses the results of PIMMS with
the assumption of a power-law spectrum with photon indices (alpha) of
2.4, 1.7, and 1.0, and absorption of
H I cm
. The user enters a vlaue for
alpha between 1.0 and 2.4 where 1.0 will select the hard spectrum, 1.7
selects the medium spectrum, and 2.4 selects the soft spectrum.
Intermediate values will produce a linear scaling between the two
nearest spectra. The exposure image is then scaled by the ratio of
the model count rates for the medium filter versus the thin or thick,
making the resultant image appropriate for the medium filter.
Warning and requirements: mosaicmerge was part of the package esas, integrated into SAS, but (still) limited to work within esas data reduction schema. This is especially true wrt input files structure and names. In particular, mosaicmerge assumes that other tasks from the package, mosspectra / pnspectra, proton and rotdet2sky have been successfully run for the exposures to be used.
