[PIPE2D-1253] Low S/N for bright FLUXSTD Created: 12/Jul/23 Updated: 28/Jul/23 Resolved: 28/Jul/23 |
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| Status: | Done |
| Project: | DRP 2-D Pipeline |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Task | Priority: | Normal |
| Reporter: | Masayuki Tanaka | Assignee: | Masayuki Tanaka |
| Resolution: | Done | Votes: | 0 |
| Labels: | None | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Attachments: |
image (1).png
image-2023-07-28-16-00-49-039.png
image (2).png
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| Description |
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Some of FLUXSTD have low S/N for their PSF flux. Here is a plot for visit=92557.
If I separate the upper/lower half of this broad correlation and plot the (RA,Dec) distribution of FLUXSTD, I got this figure. The red points are the lower half (i.e., FLUXSTDs with low S/N for their brightness). The cobra positioning accuracy was not great at the field edge and I am likely looking at that effect. But, I will look at the raster data to make sure if things are consistent. |
| Comments |
| Comment by Masayuki Tanaka [ 28/Jul/23 ] |
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This fig is based on a raster scan with with=93357 - 93364 (i.e., different visits from the plots above because they do not have a raster scan). Bluer colors mean more flux loss. The flux loss is very naively defined as the ratio between the flux at the center and the maximum flux during the raster sequence. The overall trend is similar to the plot above and the low S/N FLUXSTD is likely due to the suboptimal cobra positions at the field edge.
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