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German Astrophysical Virtual Observatory

German Astrophysical Virtual Observatory. ClusterFinder VO Methods for Astronomical Applications. Overview. GAVO A brief introduction ClusterFinder Cluster detection using Virtual Observatory methods. International Virtual Observatory Alliance. GAVO’s Pillars.

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German Astrophysical Virtual Observatory

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  1. German Astrophysical Virtual Observatory ClusterFinder VO Methods for Astronomical Applications Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  2. Overview GAVO A brief introduction ClusterFinder Cluster detection using Virtual Observatory methods Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  3. International Virtual Observatory Alliance Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  4. GAVO’s Pillars Federation of datasets Matching & Classification & Visualization (NGSE) Grid computing Theoretical VO and Theory-Observation Interface Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  5. Federation of Datasets • Towards a multi-wavelength view of universe • Matching • Classification (GAVO/ClassX) • SEDs • Web services • Based on standards + protocols • HTTP + XML or SOAP + WSDL Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  6. NGSE (Next Generation Search Engine) • Download Manager • Retrieves data from multiple distributed databases • Matcher • Matches sources based on sky-position (astronomical sources have no unique identifier) • Classifier • Uses multi-wavelength data for identification purposes • Visualization Tools Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  7. Grid computing • Cosmologic simulations running on joint MPE and AIP workstation grid (with MPI) • Grid computing for source extraction and identification programs Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  8. GAVO-GRID (Globus) GAVO-Grid Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  9. Theory in the VO • Publication of simulations • (e.g. Planck-Experiment) • Theory-observational interface • “Virtual telescope” Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  10. Files DB GAVO Architecture VO-Sites Robotic Telescopes GAVO WebPortal Grid Enabled Sites HTTP, SOAP Secure Protocols WebServices Web-GridServices Collaborative UserSpace/ DataSpace Glue- Applications, Resource Brokering ConeSearch, DB-Query Matching, Classification Astronomical Archive Computing Tasks Grid security realm Normal security realm Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  11. ClusterFinder • Simultaneous search for X-ray clusters of galaxies • X-ray photon maps (RASS) • Optical galaxy maps (SDSS) developped by P. Schuecker et al. „On a test area of 140 square degrees, 75 X-ray clusters are detected down to an X-ray flux limit of 3 x 10-13 erg s-1 cm-2 in the ROSAT energy band 0.1-2.4 keV. The clusters have redshifts z < 0.5. The survey thus fills the gap between traditional large-area X-ray surveys and serendipitous X-ray cluster searches based on pointed observations, and has the potential to yield about 4,000 X-ray clusters after completion of SDSS.“ Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  12. ClusterFinder • VO Methods • ConeSearch (HTTP-GET) • Grid computing • Webservice • Archiving of results Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  13. ClusterFinder • ConeSearch (HTTP-GET) Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  14. ClusterFinder Webservice GridQueue GridJob-Runner Archive access • CF.exe • 1processor • 100 MB memory • 10 GB dataspace • resources (maps, psf) Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  15. ClusterFinder • Grid computing • Dividing areas • Distributed jobs • Archive access • Processing • Contour plots • Mosaic Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  16. ClusterFinder • Webservice • Parameter check and assistance • Asynchronous service • Runtime information • Interface for webservices Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

  17. ClusterFinder • Archive • Parameter values (metadata) • Results • Scientific references Wiss. Beirat AIP, 01.10. 2004 ClusterFinder & VO-Methods H. Enke

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