Portfolios THE US NATIONAL VIRTUAL OBSERVATORY

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Presentation transcript:

Portfolios THE US NATIONAL VIRTUAL OBSERVATORY a framework for time-critical automated decisions Matthew J. Graham (Caltech, NVO) IVOA Trieste: VOEvent 22 May 2008

The problem IVOA Trieste: VOEvent 22 May 2008

A follow-up case study: I 10/8-11/07, PQ detects 6 strong optical transients: Not asteroids or other moving objects No matches in DSS, FIRST, NVSS, NED or SIMBAD One transient appears to have associated source in archival PQ images but is now 2 mag brighter and has increased by 0.5 mag in prior 2 days IVOA Trieste: VOEvent 22 May 2008

A follow-up case study: II Low-resolution spectra obtained with Palomar 200”: PQT071008:224527+103932 SNIa, sim. to SN2000cx, around max, z=0.046 PQT071008:230627+095342 SNIa, about 1 month past max, z~0.07 PQT071010:015849-022627 Poss. SNIa before max PQT071009:024105-033814 SNIa, sim. to SN1999a, about 9 days before max, z ~ 0.135 PQT071011:031515-034914 Quasar, z = 1.26 PQT071010:034520-012111 Probable blazar, featureless continuum IVOA Trieste: VOEvent 22 May 2008

A follow-up case study: III Photometry with FTN: First and third transients have no associated nearby galaxies; fourth might be with B023830.10-035020.9 Light curves from PQ + FTN R-band data show first transient only exhibiting clear increasing brightness Coadded archival NEAT images: Third transient has no host galaxy to R ~ 23.5 High-resolution spectrum of first transient with University of Hawaii 2.2-m telescope: Type Ic supernova IVOA Trieste: VOEvent 22 May 2008

Portfolios A heterogeneous collection of: Human and machine operable source material derived and summary information tables, images, and words different media formats different network locations the relationships between them Human and machine operable IVOA Trieste: VOEvent 22 May 2008

Object Re-use and Exchange (ORE) Open Archives Initiative (OAI) standard Aggregation of data objects described as a named graph Serialized as a Resource Map in RDF IVOA Trieste: VOEvent 22 May 2008

Resource Map Relationship between Resource Map and Aggregation Typing of Resource Map Metadata about Resource Map (Dublin Core) Metadata about Resource Map Relationship between Aggregation and Aggregated Resources Typing of Aggregation Other Identifiers of the Aggregation Relationships between Aggregation and Other Resources IVOA Trieste: VOEvent 22 May 2008

Reimagining the case study IVOA Trieste: VOEvent 22 May 2008

Machines that blog PortfolioWiki Every VOEvent has an ORE-based portfolio Human sees it as a wiki page Metadata marked up with RDFa Machine accessible via RESTful interface Agent converts email to annotation Other agents can data mine and annotate IVOA Trieste: VOEvent 22 May 2008

Summary In spite of a long history, transient astronomy is now a burgeoning field Orchestrate follow-up data cascade Human and machine accessibility Significance of data relationships for classification ORE provides framework for portfolios IVOA Trieste: VOEvent 22 May 2008