(r1) TheoreticalDataUCDProposal < IVOA

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---+ Theoretical Data UCD Proposal

This page is intended to be a *UCD suggestions collecting point* for quantities used in simulations (cosmological, stellar, ...). The aim is to help the integration of theoretical data inside the VO.%BR% This page is specific for theoretical data UCDs, for more general requirements regarding _Theory_ inside the VO please have a look at [[MiguelCervino][MiguelCervi&ntilde;o]]'s [[IVOATheoryGeneralRequirements][IVOA Theory: General Requirements]] page.

The final goal is provide a set of UCDs to be submitted via the RFM (Request For Modification) web form and then, if approved, to be added to the Standard UCD1+ Common Vocabulary.

*Note*. Please, before adding your suggestions, have a look at these IVOA documents:
   * *The UCD1+ controlled vocabulary* Version 1.23%BR%IVOA Recommendation 02 April 2007 (http://www.ivoa.net/Documents/latest/UCDlist.html)
   * *Maintenance of the list of UCD words* Version 1.20%BR%IVOA Recommendation 28 May 2006 (http://www.ivoa.net/Documents/latest/UCDlistMaintenance.html)
   * *An IVOA Standard for Unified Content Descriptors* Version 1.10%BR%IVOA Recommendation 19 August 2005 (http://www.ivoa.net/Documents/latest/UCD.html)

Hereafter you can find a table where you can add your UCDs and comment those already suggested by other people interested in this field. If some ideas seem not to fit into the table schema at page bottom there's also a part devoted to other comments and suggestions.

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*Open discussion UCD table*
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|*proposed UCD*|*Description*|*Remarks*|*Comments*|
|src.hubble0   |Hubble constant, H0, equals the Hubble parameter at z=0  | |These 2 UCDs can maybe be simplified into one  |
|src.hubble    |hubble paramater, H  | |^|
|src.omega     |density parameters of the universe  |to be used as root for all _omegas_ used or alone to indicate the the global density parameter  | |
|src.omega.matter  |matter density parameter  | |just a few examples of _omegas_ (add all the others you need)  |
|src.omega.lambda  |cosmological constant related density parameter  | |^|
|src.omega.baryon  |baryon content density parameter  | |^|
|src.omega.radiation  |radiation related density parameter  | |^|
|src.omega.stellar  |stellar content density parameter  | |^|
|src.sigma8    |initial spectrum normalization parameter  | | |
|phys.temperature.emissionweighted  |emission-weighted temperature  | | |
|phys.temperature.massweighted  |mass-weighted temperature  | | |
|phys.temperature.speclike  |spectrum-like temperature  | | |
|phys.radius.rhocritic  |radius (of an object, say a cluster of galaxies) where the density equals the critical density of the universe  |the critical density is used as a comparing term to other densities, also used as a reference for the above mentioned density parameters. Usually one describes radial distances inside clusters, for example, as N times the radius where the density equals the critical density  |Another way to define such relations could be use a src.rhocritic word and then the compounds like phys.radius;src.rhocritic.  This ucd can also be used to specify where some quantities are evaluated, i.e. phys.temperature.speclike;phys.radius.rhocritic  |
|phys.radius.rhocritic.NNN  |NNN times the rhocritic-radius  |extensions to the critical radius concept, with NNN usually 200, 500, 2500  |^|
|???  |gas or gas related |propose a way to define objects interesting in simulation but not only in simulations, like gas, stars, galaxies. These UCDs can be useful as _S_ words to specify to what the quantities are referred to, i.e. phys.mass of what? a star? the halo of a galaxy?  |maybe using object.gas?  |
|^|dark matter related  |^|object.dm?  |
|^|stars or stellar objects related  |^| object.stellar?  |
|...  | ...and so on  |^| |
|src.cosmologicalmodel?  |cosmological model used  |Lambda Cold Dark Matter, other  | |
|???  |code used for the simulation  | | |
|src.boxsize  |linear dimension of the cosmological box simultaed  | | |

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*Other Notes and Comments*
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   * There are many quantities related to cosmology. An idea can be adding the *cosm* _category_ in UCDs removing the _S_ word *phys.cosmology*. (Same also is true for other fields)
      * _supporting_: simplify some UCDs
      * _against_: complicate UCD Vocabulary

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Topic revision: r1 - 2007-10-19 - MarcoMolinaro
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