Bug #2391
Reduce structure in residual spectrum when using energy dispersion
| Status: | Rejected | Start date: | 03/07/2018 | |
|---|---|---|---|---|
| Priority: | Normal | Due date: | ||
| Assigned To: |  Knödlseder Jürgen | % Done: | 100% | |
| Category: | - | |||
| Target version: | 1.5.1 | |||
| Duration: |
Description
When simulating a source and fitting the source with the simulated spectrum, there are some spectral residuals when applying energy dispersion. Below some residual plots generated with csrespec for gammalib version 1.5.0., i.e. without the energy dispersion kludge, and with the current bugfix version 1.5.1. There seems to be some structure in the residual spectrum that is not there when the data are simulated and analysed without energy dispersion.
| 1.5.0 | 1.5.1 | without energy dispersion |
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The data are simulated for the energy interval 20 - 150 GeV, which is of course an extreme interval.
result_south_seed1_nobgd_edisp_inputmodel.png (39.7 KB)
resspec_south_seed1_nobgd_edisp_orig.png (38.2 KB)
j0948_high.dat 
(972 Bytes)
f9_inmodel_0948_high_nobgd.xml
(555 Bytes)
resspec_south_seed1_nobgd_noedisp.png (38.6 KB)
resspec150_south_seed1_nobgd_edisp_orig_x10.png (39.5 KB)
resspec150_south_seed1_nobgd_noedisp_orig_x10.png (36.9 KB)
resspec151_south_seed1_nobgd_noedisp_x10.png (36.9 KB)
resspec151_south_seed1_nobgd_edisp_orig_x10.png (38.2 KB)
Recurrence
No recurrence.
History
#1
Updated by Knödlseder Jürgen over 6 years ago
- File resspec150_south_seed1_nobgd_edisp_orig_x10.png added
- File resspec150_south_seed1_nobgd_noedisp_orig_x10.png added
- File resspec151_south_seed1_nobgd_edisp_orig_x10.png added
- File resspec151_south_seed1_nobgd_noedisp_x10.png added
- Status changed from New to Rejected
- % Done changed from 0 to 100
It turned out that the features in the plot were spurious. With a ten times increased source flux there are no obvious features, hence the issue is rejected.
| 1.5.0 | 1.5.1 | |
| Without energy dispersion |  |
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| With energy dispersion |  |
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