Canadian Virtual Observatory David Schade Canadian Astronomy Data

Canadian Virtual Observatory David Schade Canadian Astronomy Data Centre Pat Dowler, Daniel Durand, Luc Simard, Norm Hill, Severin Gaudet

Canadian Virtual Observatory Virtual Observatories: June 10 -14, 2002 The Canadian Virtual Observatory is a reality – IT WORKS – CVO is funded by National Research Council Canada and the Canadian Space Agency • $4. 3 million over 3 -5 years – Design: Working CVO architecture – Content: WFPC 2 associations pipeline, 12, 000 images and 18. 6 million sources

Virtual Observatories: June 10 -14, 2002 CVO system components • User interface – Database exploration with constraints • API based on JAVA/JINI – Others could use our API to access our system effectively • Content – WFPC 2 images and catalogues • CADC infrastructure – – Database servers Processing Storage Web servers

Virtual Observatories: June 10 -14, 2002 VO Architecture Archive Vo. Pix Archives publish to the VO Vo. Src Web interface to archive Vo. Proc Pat Dowler at ADASS

Virtual Observatories: June 10 -14, 2002 VO Architecture Vo. Pix An idealized representation of pixel data free from archive-specific descriptors Source measurements free from archive-specific descriptors Vo. Proc Instances of processing Classes of processing Vo. Src

VO Architecture Virtual Observatories: June 10 -14, 2002 Drill down • Scientists must be able to drill down from a catalogue entry: – – Processing details Pixels Input parameters Raw pixels • Measurements reproducible • Data integrity – Data Verification procedures – Online documentation – Refereed publications

Virtual Observatories: June 10 -14, 2002 VO Architecture Object catalogues Science Project Vo. Object catalogues combine multiwavelength sources into an object identification Production of object catalogues is a science process. The master object catalogue is a representation of the state of our astrophysical knowledge.

VO Architecture Virtual Observatories: June 10 -14, 2002 Pixels sample • Energy • Space • Time Processing table links back to archive

VO Architecture Source Table Virtual Observatories: June 10 -14, 2002

Content Virtual Observatories: June 10 -14, 2002 WFPC 2 associations, stacks, source catalogues • What we have now – 12, 300 stacks in 6 filters – 18. 6 million sources • What we will have this year – 25, 000 stacks – 30 million sources – Object catalogues

WFPC 2 catalogues Virtual Observatories: June 10 -14, 2002 Sextractor (Bertin) for object detection/photometry

Processing and storage hardware How do we do it • WFPC 2 associations (ST-ECF/CADC • collaboration) New storage/processing environment – 20 AMD 1. 5 GHz for processing – 18 Terabytes for storage • We can do 25, 000 stacks and extract 30 million sources in a few weeks Virtual Observatories: June 10 -14, 2002

Future CVO : this year Virtual Observatories: June 10 -14, 2002 • CVO Prototype released to the public July 15 • Release CVO Phase II near the end of 2002 – Add 2 MASS catalogues • Explore inter-operability prototype (2 MASS) • Explore ACS collaboration with STSc. I, ST-ECF, CADC • Increase WFPC 2 content – 25, 00 stacked images – 30 million sources with high-quality imaging • Object Catalogues

Future CVO Virtual Observatories: June 10 -14, 2002 • Develop the functionality of the CVO • Link with other interesting pixel/catalogue datasets • Generate more high-quality VO content • CFHT Legacy Surveys – – – Partnership with CFHT, TERAPIX, CDS Science: Supernovae, Weak Lensing, Kuiper Belt 500 nights/5 years: Wide and deep components 50 million objects with high-quality imaging Processed image products and catalogues 100 Terabyte project CFHT Legacy Surveys