DS6.1x Test Report
This is a validation test of DS 6.11 after the J. Davis fix on
the wavelength scale problem (in tg_resolve_events). In brief,
the wavelength scale problem is no longer outstanding, while
other geometrical issues (mostly related to LETG) may still
remain unresolved.
LETG + HRC-S:
A MARX simulated LETG+HRC-S dataset is processed with
DS6.10 and DS6.11. The resulted plots speak themselves
about the improvement.
Figure 1: Wavelength vs. Wavelength Offset plot for a
LETG+HRC-S +1st order configuration: (top) processed with DS6.10
and (bottom) DS6.11. Each bar marker (not error bar, btw) indicates
the centroid position for the offset distribution at that bin.
Look closer to the bar markers.
Figure 2: Wavelength vs. Wavelength Offset plot for a
LETG+HRC-S +1st order configuration: (top) processed with DS6.10
and (bottom) DS6.11. The same data points as shown in Figure 1.
As J. Drake points out, there exists a constant offset (-0.005AA)
in wavelength across HRC-S chips. The similar effect is also seen
in the -1st order as well.
Figure 3: Wavelength vs. Wavelength Offset plot for a
LETG+HRC-S -1st order configuration: (top) processed with DS6.10
and (bottom) DS6.11.
Figure 4: Wavelength vs. Wavelength Offset plot for a
LETG+HRC-S -1st order configuration: (top) processed with DS6.10
and (bottom) DS6.11. The same data points as shown in Figure 3.
HETG + ACIS-S:
A MARX simulated HETG+ACIS-S dataset is processed with
DS6.10 and DS6.11. The results are identical to that of LETG+ACIS-S.
Figure 5: Wavelength vs. Wavelength Offset plot for a
HETG+ACIS-S +1st order configuration: (top) processed with DS6.10
and (bottom) DS6.11. Each bar marker (not error bar, btw) indicates
the centroid position for the offset distribution at that bin.
Look closer to the bar markers.
Figure 6: Wavelength vs. Wavelength Offset plot for a
HETG+ACIS-S +1st order configuration: (top) processed with DS6.10
and (bottom) DS6.11. The same data points as shown in Figure 5.
Notice the increasing trend in wavelength offset across a single ACIS CCD
chip. We do not understand the cause of the tilt (actually one can spot the
same effect in Jeremy's memo).
The scale of this particular anomaly is much smaller than the absolute accraucy
required for HETG in any case, however. The similar effect is also seen in the -1st order as well.
Figure 7: Wavelength vs. Wavelength Offset plot for a
HETG+ACIS-S -1st order configuration: (top) processed with DS6.10
and (bottom) DS6.11.
Figure 8: Wavelength vs. Wavelength Offset plot for a
HETG+ACIS-S -1st order configuration: (top) processed with DS6.10
and (bottom) DS6.11. The same data points as shown in Figure 7.
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