This is an example of events plotted in sky coordinates. The points
are colored according the the part of the spectrum to which they
belong, as given by the TG_PART column in the events file.
The zero-order is colored blue,
HEG is green,
and MEG is red.
Other features to note: The narrow streak diagononally through
zero-order is the CCD frame-shift aliasing in CHIPY (since the
exposure continues while the CCD is read); The broad diagonal band is
a quadrant boundary; and the discontinuity in event density is the
S2-S3 chip boundary (so plus orders are towards the top).
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| These two plots show the order-sorting regions for MEG and HEG. The horizontal axis is the order times wavelength (TG_MLAM column) and the vertical is the ratio of the first order grating wavelength (abs(TG_MLAM)) to the CCD "wavelength" (hc/ENERGY). Events are colored according to the order assigned by tg_resolve_events, using the order-sorting map file (osip table, rmfile parameter). | ||
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| Things to note: The up-down wiggle on the negative order side is due to poorly corrected serial charge-transfer-inefficiency (CTI) in chip S1. The regions have been adjusted to account for this. |
| These two plots show the events for MEG and HEG in diffraction coordinates. The horizontal axis is the wavelength (TG_LAM column) and the vertical is the cross-dispersion coordinate (TG_D column). | ||
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| Things to note: Emission lines are apparent, such as O VIII (19A) and Ne X (12A); the diagonal streaks in the MEG spectrum are due to some mis-aligned gratings; the full range in TG_D is about -0.005 to +0.005 degrees. The binned spectrum applies source and background regions in the TG_D direction. |