Demonstration of VO Tools and Technology Tamás Budavári Johns Hopkins University

9/13/2004NVO Summer School, Aspen VO Tools Direct access to Images Spectra Catalogs Higher level Cross match etc.

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9/13/2004NVO Summer School, Aspen SDSS Image Cutout Build JPEG mosaics For given (RA, Dec) Arbitrary zoom levels Overplot catalog data Overplot geometry MapQuest like navigation List of objects Web services JPEG returned in DIME or byte array in XML Kudos to Maria Nieto-Santisteban

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9/13/2004NVO Summer School, Aspen Spectrum Services Public repository 500,000 spectra (2B row) Spatial search and more Register & submit yours Web site On-the-fly plotting Building composites Web services More options and tools Kudos to László Dobos

9/13/2004NVO Summer School, Aspen Bandpass Services Public repository Search by keyword or eff Extract in various formats Register & submit yours Web site On-the-fly plotting Easy access to all Web services To code against

9/13/2004NVO Summer School, Aspen

9/13/2004NVO Summer School, Aspen Catalog Access U wanna talk database? Structured Query Language or SQL for short (standard) Simple syntax SELECT FROM WHERE SELECT FROM WHERE For example: select ra, dec from galaxy where r<19 What else do we need? To specify area on sky Could be very complicated Standard interface to DBs XML Web Services for interop Tools to federate archives Dynamically for flexibility Astronomical Data Query Language

9/13/2004NVO Summer School, Aspen Open SkyQuery SkyNode interface to archives Implements ADQL returns VOTable Basic node understands REGION Full node understands XMATCH SkyQuery portal Knows the SkyNodes from Registry Understands federated query

9/13/2004NVO Summer School, Aspen Summary Direct access to Images Spectra Catalogs Higher level Cross match etc. Your project here

9/13/2004NVO Summer School, Aspen Project Ideas Average QSO spectrum? Composite spectrum of the 20 most distant SDSS quasars? Average spectrum as a function of redshift? Try a few redshift bins by hand this afternoon (pick ~10-20 objects for each bin) Write code to analyze many more redshift bins (flat z histogram inside bin?) Favorite object? Get image, spectrum and/or catalog data for your pet galaxy Don t remember the coords? Try name resolver at Build a series of SDSS mosaic images Get images of astronomical objects given by RA and Dec (or by name?) Write code to make a movie zooming on any given galaxy (coords or name) Your idea here …

9/13/2004NVO Summer School, Aspen Where to go Links in the talk Other relevant links