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VOYAGE

VOYAGE. V irtual O bservatory, Y et A nother G reat E xtension ?!. Alexander Knebe, Swinburne University. should simulation data be included in a Virtual Observatory ?. what ? why ? how ?. …this is all biased towards cosmological n-body simulations. VOYAGE.

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VOYAGE

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  1. VOYAGE Virtual Observatory, Yet Another Great Extension ?! Alexander Knebe, Swinburne University should simulation data be included in a Virtual Observatory ? • what ? • why ? • how ? …this is all biased towards cosmological n-body simulations

  2. VOYAGE what are (cosmological) simulations anyway ? what ?

  3. VOYAGE what determines the model ? • rotation curves of galaxies • existence of Dark Matter ->DM • hierarchical structure formation • nature of Dark Matter ->CDM • high redshift observations • cosmology ->LCDM observations (Bahcall et al. 2001) model fixed ? testing model using N-body simulations reveals… what ?

  4. VOYAGE what’s the problem ? • high resolution N-body simulations: • observations: • steep, cuspy density profiles • hundreds of satellite galaxies • small disk sizes <-> <-> <-> • mostly shallow density cores • only a few satellites observed • larger disk sizes breakdown of CDM paradigm on scales < 1 Mpc ? what ?

  5. correct models ? correctly measured? VOYAGE time for a VOYAGE ? i.e., observed number of satellite galaxies orbiting in dark matter halo • more data needed: • from observers • from simulators (Klypin et al. 1999) why ?

  6. VOYAGE why should VO be extended ? • simulations are time intensive • simulations contain 6D information: x(t), v(t) • cross-comparison of models possible • let’s pull the strings together: • problems get solved only by exchange of ideas • simulators need observers to gauge and improve models • observers need simulators to calibrate observations why ?

  7. VOYAGE simulations lead to observations ?! one ring encompasses it all ? simulated tidal stream of disrupted satellite galaxy observed stellar stream in own milky way halo (Odenkirchen et al. 2003) milky way type dark matter halo (Gill et al. 2002) why ?

  8. VOYAGE a little survey based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations, IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470) how ?

  9. VOYAGE has the VOYAGE already begun ? • VIRGO SCDM, CDM, OCDM, CDM model • 2563 particles • 239.5 Mpc/h box • “Hubble Volume”CDM, CDM model • 10243 particles • 3000 Mpc/h box • “COBE grid” 68 (COBE-normalized) models (more than you can poke a stick at…) • 643 particles • 128 Mpc/h box • NEMO data archive collection of links to data releases • plus some more by individual groups… all in non-compatible data formats, but the data is being used ! how ?

  10. VOYAGE can one feed on data alone ? • available codes:(mostly no analysis tools distributed !) • MLAPM adaptive multi-grid code (Knebe et al. 2001) • GADGET tree-SPH code (Springel et al. 2000) • HYDRA AP3M code (Couchman et al. 1995) • hierarchical TreeCode ultra-fast (!?) tree code (Dehnen 2000) • PM code simple PM code (Klypin 1995) (incl. analysis tools !) most codes are proprietary products ! http://astronomy.swin.edu.au/cosmology how ?

  11. VOYAGE is there any consistency ? • The Santa Barbara Cluster Comparison Project (Frenk et al. 1999) • the oponents • 6 Lagrangian codes (particle based) • vs. • 5 Eulerian codes (grid based) • the outcome • reassuring but alsoconfusing • the winner ? how ?

  12. VOYAGE what’s the bottomline ? • add data • add basic analysis (“simulated observations”) • add software: • codes • analysis tools how ?

  13. VOYAGE is it feasible ? • requires great coordination • requires input from simulators • simulations outdate quickly... hmm ?

  14. VOYAGE Swinburne’s contribution • MLAPM is already publically availablehttp://astronomy.swin.edu.au/MLAPM • next MLAPM version will contain on-the-fly analysis • we do have sophisticated visualisation tools for MLAPM data • we do have high-resolution data (cf. Daisuke Kawata’s talk) • we are more than happy to be part of this VOYAGE ! !!!

  15. z=1 z=0 z=5 z=3 VOYAGE Swinburne’s contribution • filament fragmentation CDM (Knebe et al. 2003) WDM !!!

  16. VOYAGE Swinburne’s contribution • streams from disrupted satellite galaxies (Gill et al. 2002) !!!

  17. VOYAGE Virtual Observatory, Yet Another Great Extension ?! Alexander Knebe, Swinburne University thank you for your attention and bon voyage...

  18. VOYAGE is there any consistency ? • The Santa Barbara Cluster Comparison Project temperature profile entropy profile grid based codes particle based codes grid based codes particle based codes (Frenk et al. 1999) how ?

  19. VOYAGE a little survey based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations, IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470) how ?

  20. VOYAGE a little survey based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations, IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470) how ?

  21. VOYAGE a little survey based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations, IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470) how ?

  22. VOYAGE a little survey based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations, IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470) how ?

  23. VOYAGE a little survey based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations, IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470) how ?

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