[PIPE1D-51] Bad redshift determination with version 0.22.0? Created: 26/Jul/21 Updated: 09/Sep/21 Resolved: 09/Sep/21 |
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| Status: | Won't Fix |
| Project: | DRP 1D pipeline |
| Component/s: | drp_1d, drp_1dpipe |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Story | Priority: | Normal |
| Reporter: | Kiyoto Yabe | Assignee: | vlebrun |
| Resolution: | Won't Fix | Votes: | 0 |
| Labels: | DRP_end-to-end_processing | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Attachments: |
check_redshift_determination.pdf
parameters_e2e.json
pfsObject-00001-00000-0,0-0000000000000318-006-0x7ace412dc05971ff.fits
Skyline_1226nm
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| Description |
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The simple sanity check on the redshift determination in the recent end-to-end processing (see attached) seems to show strangely bad redshift determination. The redshifts from 1D pipeline are mostly ~0.9 or ~2.3. Could you confirm that this is real or I'm doing something wrong? I'm using version 0.22.0 and the configuration is attached. The results are also in https://pfs.ipmu.jp/internal/devarch/ipmu/pipe_e2e/ . check_redshift_determination.pdf |
| Comments |
| Comment by Kiyoto Yabe [ 26/Jul/21 ] |
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This may be due to the issue in |
| Comment by Kiyoto Yabe [ 02/Aug/21 ] |
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This is an example pfsObject, which is z=1.4979 object but the 1D result is 2.2925. pfsObject-00001-00000-0,0-0000000000000318-006-0x7ace412dc05971ff.fits |
| Comment by vlebrun [ 27/Aug/21 ] |
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The two horizontal lines in the z_meas vs z_true plot are typical of artefacts at given wavelength that are mistaken for emission lines. z=2.29 is a redshift for which OII corresponds to a strong sky emission line, and therefore the subtraction residual can be identified as OII (see plot Skyline_1226nm |
| Comment by vlebrun [ 09/Sep/21 ] |
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Indeed the error associated to the spectrum does not indicate that this pseudo emission line is not real but the mask has a non zero value. We therefore have to include the mask values in the 1D pipeline. I'll open a new ticket |
| Comment by Kiyoto Yabe [ 09/Sep/21 ] |
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Thank you for the investigation. Can I close this ticket and move to the new ticket? |
| Comment by vlebrun [ 09/Sep/21 ] |
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yes for sure |
| Comment by Kiyoto Yabe [ 09/Sep/21 ] |
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OK, thank you. I closed this one. |
