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Canadian Virtual Observatory
David Schade
Canadian Astronomy Data Centre
Pat Dowler, Daniel Durand, Luc Simard, Norm Hill,Severin Gaudet
Virtual Observatories: June 10-14, 2002
Canadian Virtual Observatory
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: WFPC2 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– WFPC2 images and catalogues
• CADC infrastructure– Database servers– Processing– Storage– Web servers
Virtual Observatories: June 10-14, 2002
VoPix
VoProc
VoSrc
VO Architecture
Archive
Web interface to archive
Archives publish to the VO
Pat Dowler at ADASS
Virtual Observatories: June 10-14, 2002
VoPix
VoProc
VoSrc
VO Architecture
An idealized representation of pixel datafree from archive-specific descriptors
Instances of processingClasses of processing
Source measurements free fromarchive-specific descriptors
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
V i r t u a l O b s e r v a t o r i e s : J u n e 1 0 - 1 4 , 2 0 0 2
V o P i x
V o P r o c
V o S r c
V O A r c h i t e c t u r e
A r c h i v e
VO Architecture
Virtual Observatories: June 10-14, 2002
VoObj
Object catalogues combine multi-wavelength sources into an object identification
V i r t u a l O b s e r v a t o r i e s : J u n e 1 0 - 1 4 , 2 0 0 2
V o P i x
V o P r o c
V o S r c
V O A r c h i t e c t u r e
A n i d e a l i z e d r e p r e s e n t a t i o n o f p i x e l d a t af r e e f r o m a r c h i v e - s p e c i f i c d e s c r i p t o r s
I n s t a n c e s o f p r o c e s s i n gC l a s s e s o f p r o c e s s i n g
S o u r c e m e a s u r e m e n t s f r e e f r o ma r c h i v e - s p e c i f i c d e s c r i p t o r s
Production of object catalogues is a science process. The master object catalogue is a representation of the state of our astrophysical knowledge.
Science Project
VO Architecture
Object catalogues
Virtual Observatories: June 10-14, 2002VO Architecture
Pixels sample• Energy• Space• Time
Processing table links back to archive
Virtual Observatories: June 10-14, 2002VO Architecture
Source Table
Virtual Observatories: June 10-14, 2002
WFPC2 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
Content
Virtual Observatories: June 10-14, 2002WFPC2 catalogues
Sextractor (Bertin) for object detection/photometry
Virtual Observatories: June 10-14, 2002
How do we do it
• WFPC2 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
Processing and storage hardware
Virtual Observatories: June 10-14, 2002
Future CVO : this year
• CVO Prototype released to the public July 15
• Release CVO Phase II near the end of 2002– Add 2MASS catalogues
• Explore inter-operability prototype (2MASS)
• Explore ACS collaboration with STScI, ST-ECF, CADC
• Increase WFPC2 content– 25,00 stacked images– 30 million sources with high-quality imaging
• Object Catalogues
Virtual Observatories: June 10-14, 2002
Future CVO
• 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/5years: Wide and deep components– 50 million objects with high-quality imaging– Processed image products and catalogues– 100 Terabyte project
CFHT Legacy Surveys