https://pfspipe.ipmu.jp/jira This file is an XML representation of an issue en-us 8.3.4 803005 13-09-2019 https://pfspipe.ipmu.jp/jira/browse/PIPE2D-870 DRP 2-D Pipeline <p>Write a code to perform the continuum subtraction of spectra for flux calibration work in the 2DDRP pipeline. The draft code is based on the study in <a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-685" title="Median filter to whiten an uncalibrated spectrum" class="issue-link" data-issue-key="PIPE2D-685"><del>PIPE2D-685</del></a> (<a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-685" class="external-link" rel="nofollow">https://pfspipe.ipmu.jp/jira/browse/PIPE2D-685</a>), in which the continuum is subtracted by a median filter.</p> PIPE2D-870

Code implementation of the continuum subtraction task for flux calibration

Story Normal Done Done sogo.mineo Takuji Yamashita flux-calibration Mon, 19 Jul 2021 00:36:17 +0000 Tue, 14 Dec 2021 08:20:05 +0000 Tue, 14 Dec 2021 08:20:05 +0000 0 3 <p>Please consider the existing <tt>FitContinuumTask</tt>.</p> <p>Thank you. I will try it whether it works as I intend.</p> <p>If it doesn't, then we should look at what we need to change. I really don't want to end up with two different fitting tasks if we can avoid it.</p> <p>This is a comparison of two scripts for continuum subtraction. I tried fitContinuumTask (red) and my script that uses a median filter (blue). As a result, we can substitute fitContinuumTask in flux calibration work. A continuum from fitContinuumTask is very similar to that from my script.<br/> What fitContinuumTask is doing is similar to mine, but fitContinuumTask performs pixel binning before fitting, while my script does not. Binning dismisses lines and outlier pixels. I think this is why fitContinuumTask works better than mine around H-alpha and H-beta.<br/>  <br/>  <br/> From the top panel:<br/> 1st: two continua and an input spectrum<br/> 2nd: only two continua<br/> 3rd: continuum-subtracted spectra<br/> 4th: zoom-in of 3rd panel (see H-alpha, where my script underestimates the continuum)<br/> 5th: a ratio of two continua<br/> <span class="image-wrap" style=""><a id="13970_thumb" href="https://pfspipe.ipmu.jp/jira/secure/attachment/13970/13970_lines_mask_50knots.png" title="lines_mask_50knots.png" file-preview-type="image" file-preview-id="13970" file-preview-title="lines_mask_50knots.png"><img src="https://pfspipe.ipmu.jp/jira/secure/thumbnail/13969/_thumb_13969.png" style="border: 0px solid black" /></a></span><br/>  </p> <p>Comparisons around representive lines:<br/> <span class="image-wrap" style=""><a id="13970_thumb" href="https://pfspipe.ipmu.jp/jira/secure/attachment/13970/13970_lines_mask_50knots.png" title="lines_mask_50knots.png" file-preview-type="image" file-preview-id="13970" file-preview-title="lines_mask_50knots.png"><img src="https://pfspipe.ipmu.jp/jira/secure/thumbnail/13970/_thumb_13970.png" style="border: 0px solid black" /></a></span></p> <p>We can close this ticket because a function of the continuum subtraction (using FitContinuumTask) is now included in the main code of flux calibration, not an independent code. The continuum subtraction function in flux calibration will be reviewed in the main code (<a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-922" class="external-link" rel="nofollow">PIPE2D-922</a>). </p> Blocks PIPE2D-371 Development Epic Link PIPE2D-303 Rank 0|zzs8zc: Reviewers hassan