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Theory in the Virtual Observatory

Theory in the Virtual Observatory. Gerard Lemson, GAVO. The VO. Broad goal Make results of astronomical research, data and applications, more readily available to larger community, and create value-adding services. Facilitate: communication of results checking of results

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Theory in the Virtual Observatory

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  1. Theory in the Virtual Observatory Gerard Lemson, GAVO

  2. The VO • Broad goal • Make results of astronomical research, data and applications, more readily available to larger community, and create value-adding services. • Facilitate: • communication of results • checking of results • use of results • comparison of different results • combination of different results to create new ones • Through • online availability of datasets and applications • standardized publication and discovery mechanisms • standardized description (meta-data, FITS++) • standardized selection mechanisms • standardized form(at)s of transmitted data • value added services • Why ? Ringberg, Gerard Lemson

  3. FIRST ROSAT GAIA 2MASS SDSS Ringberg, Gerard Lemson

  4. FIRST ROSAT GAIA 2MASS SDSS Ringberg, Gerard Lemson

  5. Registry • publication • discovery • Data models • description (UCD) • Query protocols • selection (cone search, ADQL) • combination (XMatch) • Data access protocols • retrieval (VOTable) • Applications • user interfaces (Aladin) • visualisation (VOPlot) • analysis (…) Ringberg, Gerard Lemson

  6. Theory • Existing protocols not applicable • Position based queries • Combination of different archives less obvious • Data models insufficient • New “observables” • Different “provenance” • Different characterization • More complex data structures • Less well developed history of archiving • No FITS for simulations • New use cases • Theorists : data mining simulation results • Observers : virtual telescope Ringberg, Gerard Lemson

  7. Archiving of simulations • Use relational database • GalICS • SDSS • Halo merger trees from milli-Millennium • data model for trees • SAM galaxy catalogues • links to halos • add merger trees • SQL query interface • http://www.g-vo.org/mpasims (Springel, Croton, Blaizot) • Soon: add dynamic SAM to interface Ringberg, Gerard Lemson

  8. Virtual Telescope Observed Simulated Thanks to Volker Springel Thanks to Alexis Finoguenov, Ulrich Briel, Peter Schuecker, MPE) Ringberg, Gerard Lemson

  9. Virtual Telescope • Use simulations for help in interpreting observations (e.g. Peter Schneider for this morning) • Bring simulations into “observational plane” • Create results similar to observations • Can be analysed with same techniques as observations • Can be compared “directly” to obs-s\ • Use cases: • Check observational biases using realistic models • Survey/observation planning • Check models to observations Ringberg, Gerard Lemson

  10. Prototypes • Visualisation • Smac (Dolag) • MoMaF (Blaizot) • Virtual telescope • http://www.g-vo.org/planck Ringberg, Gerard Lemson

  11. Interoperability: Virtual telescope configuration • Components • simulations • telescope models • foregrounds (incl. lensing) • Specification • “pre-observation image” • interfaces • workflow • Implementations … Ringberg, Gerard Lemson

  12. Virtual telescope data flow

  13. Quotes: • "I think the global virtual observatory is a fantastic idea" - Martin Rees, Physics Today, Feb 2002 • ... too much money will be sunk into software; ... archives at ground-based observatories should be brought up to snuff before thinking about linking them; and ... users won't be able to trust the processed data they call up.“ - Physics Today, Feb 2002 • “… that VO nonsense …” - anon, Ringberg 2005 Ringberg, Gerard Lemson

  14. Discussion • What do you want from the VO ? • What should VO projects focus on ? • What could/do you contribute to the VO ? • Why is the VO a waste of resources ? • Should spend money on more postdocs. • What are the dangers of the VO? • Too easy to do to bad science. • What are the possible advantages of the VO? • Easier to do good, new science. • Easy to check bad science. Ringberg, Gerard Lemson

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