<div dir="ltr"><div><div><div>Hi Mark,<br><br></div>This type of normalization is often used in stellar astronomy in order to measure equivalent width of spectra lines. And as far as I know, even now most astronomers working in the field prefer to define it manually, i.e. subjectively. If you drop by my office at the CfA before you leave to Sesto, I can probably explain you what exactly is needed to define this continuum type and provide some examples<br><br></div>With best regards,<br></div>Igor<br><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jun 10, 2015 at 11:16 PM, CresitelloDittmar, Mark <span dir="ltr"><<a href="mailto:mdittmar@cfa.harvard.edu" target="_blank">mdittmar@cfa.harvard.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>Petr,<br><br></div>Thanks for the questions, I like to get input on use-cases which aren't (perhaps) covered by the current model. The scope and coverage of the Spectral-2.0 model hasn't changed in some time. Recall, that this document has been through the PR and RFC stages, the latest updates have been to address TCG review comments.<br><br></div>comments below:<br><div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jun 4, 2015 at 8:37 PM, Petr Skoda <span dir="ltr"><<a href="mailto:skoda@sunstel.asu.cas.cz" target="_blank">skoda@sunstel.asu.cas.cz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Mark and all DM members<br>
<br>
Unfortunately I do not have time to go through tiny details of SDM 2.0<br>
But I would like to be assured (by you) that there is a simple answer to these issues:<br>
<br>
1) normalized spectra - I mean continuum normalized (i.e the horizontal line of continuum is at 1.0)<br>
Those do not have by definition units - its just relative ratio - it was somehow defined in older SDMs as a ration and some reference (but no one defined yest how to refer to the description of contiuum) - in practise all usefull optical spectra should be continuum normalized by pipeline (or manually) already before ingesting in SSA services ....<br>
How to describe the Fluxunit and UCDs on flux etc ..... ?<br></blockquote><div><br></div><div>I'd like to spend some time with you in Sesto to understand the particulars of what would be needed to describe the continuum. I think Mireille' suggestion for the UCD and unit sounds about right.. <br></div><div>There is this record in the FluxAxis ucd list for ucd, description, unit respectively.<br></div><div> "phot.flux.density;arith.ratio" "Flux ratio of two spectra" (empty string)<br></div><div> <br></div></div></div></div></div></div></div>
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