Theoretical Data UCD Proposal

[Gerard]

Dear Marco

Would it be possible for you to organize this work together with Franck Le
Petit, who is leading a corresponding effort within the theory interest
group?

Thanks

Gerard Lemson


> -----Original Message-----
> From: owner-theory at eso.org [mailto:owner-theory at eso.org] On Behalf Of
> Marco Molinaro
> Sent: Monday, October 22, 2007 10:54 AM
> To: semantics at ivoa.net; theory at ivoa.net; andrea.preitemartinez at iasf-
> roma.inaf.it
> Subject: Theoretical Data UCD Proposal
> 
> Dear all,
> we want to start writing down a list of quantities for theoretical data
> and then propose these quantities for inclusion into the UCD1+
> controlled vocabulary.
> The ITVO group works on cosmological simulations and stellar evolution
> models. As a first step these notes notes are dealing with cosmological
> quantities.
> The underlying idea is to contribute to the
> 
> http://www.ivoa.net/twiki/bin/view/IVOA/IVOATheoryGeneralRequirements
> 
> discussion and, at the same time, suggest some ucds for simulated data.
> We opened a wiki page where everyone can add missing quantities and
> related ucds
> 
> http://www.ivoa.net/twiki/bin/view/IVOA/TheoreticalDataUCDProposal
> 
> We feel the absence of the cosmological parameters' ucds, like:
> 
> H, H0 - Hubble parameter, constant
> all the 'omega' parameters (matter, baryon, lambda, ...)
> sigma8, spectrum-normalization parameter.
> ...
> 
> For all of these we are, at present, using the not-so-descriptive
> src.morph.param;phys.cosmology ucd compound and this is a problem
> because cosmological simulations make large use of these parameters for
> their description.
> Maybe another important parameter to add is the expansion factor which
> pairs the cosmological redshift (for this last the ucd already exists).
> 
> Other ucds we want to add (or ask attention for) are related to the
> 'temperatures' used, for example in galaxy clusters simulations. we
> think a good idea is to add ucds like
> 
> phys.temperature.emissionweighted
> phys.temperature.massweighted
> phys.temperature.speclike
> 
> following the idea of the existing .effective and .electron ones.
> Another ucd, or ucd group, could be related with the 'critical density'
> radius, adding the simple phys.radius.rhocritic and/or its extensions to
> phys.radius.rhocritic.NNN (namely NNN=200, 500, 2500).
> Maybe another choice for this problem could be something like
> phys.size.radius;phys.cosmology.rhocritic
> which is better if one wants to relate the critical density to other
> quantities than the radius (let's say:
> phys.temperature.speclike;phys.cosmology.rhocritic)
> 
> To simplify all these ucds an idea could be adding a new category, to
> the already existing 12, named 'cosm' to replace the phys.cosmology
> which is an 'S' word. But I don't know if the resulting semplification
> in the single ucds is a sufficient gain compared to adding a categorie
> in the UCD schema.
> 
> We also want to add other ucds like:
> - 'object.gas', 'object.stellar', 'object.darkmatter', ...and so on, as
> 'S' words to specify which masses, temperatures or other quantities we
> are talking of
> - a ucd for the cosmological model of the simulation
> - a ucd for the code used in the simulation
> - a ucd for the linear size of the simulated cosmological box
> 
> Together with these proposed ucds we want to focus the attention of the
> community on the ucds needed by the stellar simulations.
> 
> Regards
> 	Marco
> 
> Marco Molinaro
> INAF - Trieste Astronomical Observatory
> Phone.: +39 040 3199 152
> e-mail: molinaro at oats.inaf.it
> web site: http://wwwas.oat.ts.astro.it/