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.
This page is specific for theoretical data UCDs, for more general requirements regarding Theory inside the VO please have a look at MiguelCerviño's 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
  IVOA Recommendation 02 April 2007 (http://www.ivoa.net/Documents/latest/UCDlist.html)
• Maintenance of the list of UCD words Version 1.20
  IVOA Recommendation 28 May 2006 (http://www.ivoa.net/Documents/latest/UCDlistMaintenance.html)
• An IVOA Standard for Unified Content Descriptors Version 1.10
  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.

proposed UCD	Description	Remarks	Comments
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	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
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		just a few examples of omegas (add all the others you need)
src.omega.baryon	baryon content density parameter		just a few examples of omegas (add all the others you need)
src.omega.radiation	radiation related density parameter		just a few examples of omegas (add all the others you need)
src.omega.stellar	stellar content density parameter		just a few examples of omegas (add all the others you need)
???	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?
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.sigma8	initial spectrum normalization parameter
phys.temperature.emissionweighted	emission-weighted temperature
phys.temperature.massweighted	mass-weighted temperature
phys.temperature.speclike	spectrum-like temperature
...	...and so on	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?
src.cosmologicalmodel?	cosmological model used	Lambda Cold Dark Matter, other
???	code used for the simulation
src.boxsize	linear dimension of the cosmological box simultaed
???	dark matter 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?	object.dm?
???	stars or stellar objects 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?	object.stellar?
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		These 2 UCDs can maybe be simplified into one

• 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