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-401 DRP 2-D Pipeline <p>Contamination of the HgAr data with the continuum remains the problem. The reduction pipeline has algorithm that should remove this effect. <br/> This is to 1. Estimate the quality of this subtraction - if good enough use this for focused images<br/> 2. Use the insights (i.e., the function form of the continuum as a function of wavelength) to subtract the defocused images, as well.</p> PIPE2D-401

Removal of HgAr continuum in focus and defocus

Task Normal Done Done ncaplar ncaplar Tue, 9 Apr 2019 17:17:06 +0000 Thu, 12 Mar 2020 14:38:03 +0000 Thu, 27 Jun 2019 15:19:48 +0000 0 1 <p>I have modified the code used in drp_stella in order to make a global fit to the continuum. I describe the steps below:</p> <p>1. I manually extract the flux with purest tophat-extraction from the image. Example of the extracted boxes is shown in the extraction_focus_defocus.png image.</p> <p>2. Then I fit the continuum with the Akima spline, drawing heavily from <a href="https://github.com/Subaru-PFS/drp_stella/blob/master/python/pfs/drp/stella/fitContinuum.py" class="external-link" rel="nofollow">https://github.com/Subaru-PFS/drp_stella/blob/master/python/pfs/drp/stella/fitContinuum.py</a>. The example of the results for one defocused image and focused image are shown in Continuum_DeFocus.png and Continuum_Focus.png images. Red shows the excluded data, black is the data that is fitted, blue shows the spline fit and yelow shows the residuals.</p> <p>3. I use that function to remove the continuum from images. The example is shown in Removal_of_continuum.png, where I shown removal in continuum for a single spot at various levels of defocus. For the moment I have deemed the quality to be ``sufficient'', but this will soon be tested in realistic applications.</p> <p>I believe that the quality of the subtraction is ``good enough''. This is based on the insight that I see no obvious influences of the continuum on the 2d modeling results of the F/2.8 and F/2.5 data taken in April and May of 2019. If the subtraction has to be improved further I will open new tickets.</p> <p><a href="https://pfspipe.ipmu.jp/jira/secure/ViewProfile.jspa?name=kiyoto.yabe" class="user-hover" rel="kiyoto.yabe">Kiyoto Yabe</a> see this ticket, it might be helpful</p> <p> </p> Blocks PIPE2D-379 Development Rank 0|02qpt6:508yl0f Reviewers hassan Story Points 6.0