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/REDMINE1D-281 1D Redmine <p><em><font color="#505f79"> Created on 2023-08-16 09:13:50 by Didier Vibert. % Done: 0</font></em></p> <p>issue raised by @ytemmam when looking at SDSS fitted Ha vs direct-integration fluxes.</p> <p>when several elements are overlapping (eg Ha and NII) a unique wavelength offset and width (velocity dispersion) is fitted for the complex, whereas each element should have its own offset and width. Of course the fit has still to be done jointly.</p> REDMINE1D-281

[RM-8212] [linemeas] fit a distinct wavelength offset and velocity dispersion on overlapping elements

Task Normal Open Unresolved Redmine-Jira Migtation Redmine-Jira Migtation Wed, 16 Aug 2023 18:15:37 +0000 Fri, 25 Aug 2023 18:17:05 +0000 0 1 <p>Comment by Vincent Le Brun on 2023-08-24 09:41:16:<br/> Didier Vibert wrote:</p> <p>&gt; when several elements are overlapping (eg Ha and NII) a unique wavelength offset and width (velocity dispersion) is fitted for the complex, whereas each element should have its own offset and width. Of course the fit has still to be done jointly.</p> <p>is it true? If the overlap is only on the continuum the fit could be done independently . It is only if the lines overlap that a combined fit is to be done. But I'm not sure it will modify results</p> <p>Comment by Didier Vibert on 2023-08-24 12:29:21:<br/> Vincent Le Brun wrote in #note-1:<br/> &gt; Didier Vibert wrote:<br/> &gt; <br/> &gt; &gt; when several elements are overlapping (eg Ha and NII) a unique wavelength offset and width (velocity dispersion) is fitted for the complex, whereas each element should have its own offset and width. Of course the fit has still to be done jointly.<br/> &gt; <br/> &gt; is it true? If the overlap is only on the continuum the fit could be done independently . It is only if the lines overlap that a combined fit is to be done. But I'm not sure it will modify results</p> <p>the polynomial coefficients modelling the continuum have to be fitted jointly with the superposed lines: thus all lines parameters and the polynomial coeffs have to be fitted together </p> Development Rank 0|zzsz9j: