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Hello!. Virtual Observatories. Ajit Kembhavi IUCAA Pune, India. Data Storage and Retrieval. The Astronomer Vermeer 1632-1675. The Library of Alexandria 3 rd Century BC. The Data Avalanche. Immense amounts of data are being produced by large telescopes using large area detectors.

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  1. Hello!

  2. Virtual Observatories Ajit Kembhavi IUCAA Pune, India

  3. Data Storage and Retrieval The Astronomer Vermeer 1632-1675 The Library of Alexandria 3rd Century BC

  4. The Data Avalanche Immense amounts of data are being produced by large telescopes using large area detectors. Terabytesof data are now available, andPetabyteswill soon be available from frequent all sky imaging. Vast databases are also being produced throughsimulations.

  5. Astronomical Data Explosion ~ 100 Gb/night P. Quinn

  6. Data Explosion Peter Quinn

  7. Wavelength Coverage The data spans the electromagnetic spectrum from the radio to the gamma-ray region. Obtaining, analysing and interpreting the data in different wavebands involves highly specialised instruments and techniques. The astronomer needs new tools for using this wealth of data in multiwavelength studies.

  8. Stars in the Milky Way

  9. The Hertzsprung-Russell Diagram

  10. The Alliance Members of the IVOA

  11. Interactions

  12. Virtual Observatories • Provide tools for data analysis, visualization and mining. • Develop interoperability concepts to make different databases seamless. • Manage vast data resources and provide these on-line to astronomers and other users. Empower astronomers by providing sophisticated query and computational tools, and computing grids for producing new science.

  13. IVOA Technology Initiatives The IVOA has identified six major technical initiatives to fulfill the scientific goal of the VO concept. IVOA-LISTS

  14. REGISTRIES: These collect metadata about data resources and information services into a queryable database. The registry is distributed. A variety of industry standards are being investigated. DATA MODELS: This initiative aims to define the common elements of astronomical data structures and to provide a framework to describe their relationships. UNIFORM CONTENT DESCRIPTORS: These will provide the common language for for metadata definitions for the VO.

  15. DATA ACCESS LAYER:This provides a standardized access mechanisms to distributed data objects. Initial prototypes are a Cone Search Protocol and a simple Image Access Protocol. VO QUERY LANGUAGE:This will provide a standard query language which will go beyond the limitations of SQL. VOTable: This is an XML mark-up standard for astronomical tables.

  16. Science Initiatives • Many IVOA projects have active Science Working Groups consisting of astronomers from a broad cross-section of the community representing all wavelengths. • The focus here is to develop a clear perception of the scientific requirements of a VO. • Projects within the working groups will develop new capabilities for VO based analysis. • This will enable the community to create new research programs and to publish their data and research in a more pervasive and scientifically useful manner.

  17. Virtual Observatory -India A collaboration between IUCAA and PSPL, with a grant from the Ministry of Communications and Information Technology

  18. IUCAA

  19. Persistent Systems Pvt. Ltd., Pune

  20. Virtual Observatory - India

  21. Data Archives and Mirrors at VO-I SDSS 2Mass 2DFGRS 2QZ FIRST NVSS Chandra Vizier, Aladin, ADS

  22. Fast Computing • Four alpha server ES-45 nodes, each • with 4 processors, each node with 8 • GB RAM • Fast, Low latency interconnect Memory Channel Architecture • Trucluster clustering environment (Tru64 Unix, DecMPI, openMP)

  23. VO-India Software Projects VOPlot Visualizer for catalogue data VOTable C++ Parser VOTable Streaming writer Data Converters Fits Browser User interfaces and query tools Applications beyond astronomy All tools have web-based and stand alone versions

  24. The VOPlot Collaboration Visualization and simple statistics of catalogue data. Integration with sky atlases.

  25. The VOPlot Tool A VO-I + CDS collaboration First conceived as a web-based tool for Vizier Then integrated with Aladin VOPlot is now also a stand alone system It has been integrated with many data bases Sonali Kale, K.D. Balaji et. Al. VOPlot

  26. Colour-magnitude diagram parallax

  27. Catalog Data Interface Tool A tool to query catalog data. Simple, customizable, graphic interface. Not specific to type of data or catalogue. SQL queries for expert users. VO tools available for analysis: VOPlot, Aladin,VOStat, SIMBAD, NED...

  28. Data Organization and Architecture

  29. Browse Server Database Back

  30. Create Views Back

  31. On-the-fly GUI Back

  32. Query using a Form Back

  33. Query using SQL Directly Back

  34. Results in VOPlot Back

  35. Results in Aladin Back

  36. Himalaya Chandra Telescope Data Archives

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