Spectral 2.0 - Document update

[Igor Chilingarian]

Hi Mark,

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

With best regards,
Igor


On Wed, Jun 10, 2015 at 11:16 PM, CresitelloDittmar, Mark <
mdittmar at cfa.harvard.edu> wrote:

> Petr,
>
> 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.
>
> comments below:
>
> On Thu, Jun 4, 2015 at 8:37 PM, Petr Skoda <skoda at sunstel.asu.cas.cz>
> wrote:
>
>> Hi Mark and all DM members
>>
>> Unfortunately I do not have time to go through tiny details of SDM 2.0
>> But I would like to be assured (by you) that there is a simple answer to
>> these issues:
>>
>> 1) normalized spectra -  I mean continuum normalized (i.e the horizontal
>> line of continuum is at 1.0)
>> 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 ....
>> How to describe the Fluxunit and UCDs on flux etc ..... ?
>>
>
> 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..
> There is this record in the FluxAxis ucd list for ucd, description, unit
> respectively.
>     "phot.flux.density;arith.ratio"   "Flux ratio of two spectra"  (empty
> string)
>
>
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