Every raw CCD image contains counts resulting from a 'dark current', electrons released due to the thermal effects in the CCD material. For both the UVB-VIS (< 0.00012 e^-^/s/pixel) and NIR detectors (< 0.005 e^-^/s/pixel) the dark-current is almost negligible. Not all pixels will have the same dark-current, some will have a high than typical current. These are so-called 'hot-pixels' and it's important that these are identified and recorded (using the create_noise_map utility).
The purpose of the soxs_mdark recipe is to generate a master-dark frame used to remove flux attributed to the dark-current from other frames.
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| Data Type | Content | Related OB |
|---|---|---|
| FITS images | raw dark frames (exposures with identical exposure time and detectors readout parameters) | SOXS_gen_cal_VISDark, SOXS_gen_cal_NIRDark, SOXS_img_cal_Dark |
| Parameter | Description | Type | Entry Point | Related Util |
|---|---|---|---|---|
| frame-clipping-sigma | number of σ from the median frame flux beyond which pixel is added to the bad-pixel mask | float | settings file | clip_and_stack |
| clipping-iteration-count | number of sigma-clipping iterations to perform when added pixels to the bad-pixel mask | int | settings file | clip_and_stack |
| stacked-clipping-sigma | number of σ deviations from the median pixel flux beyond which pixel is excluded from stack | float | settings file | clip_and_stack |
| stacked-clipping-iterations | number of σ-clipping iterations to perform before stacking | float | settings file | clip_and_stack |
Stack raw dark-frames together (using the clip_and_stack utility) into master-dark frames and in the process clipping rogue pixels from the individual raw frames and reducing the read-noise contribution.
| Data Type | Content |
|---|---|
| master dark frame | frame containing typical dark-current flux accumulated over the exposure time of the input frames |
| Metric | Description |
|---|---|
| TBC | ... |
.. autoclass:: soxspipe.recipes.soxs_mdark
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