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3D Spectroscopy in the Virtual Observatory: Current Status

Spectroscopy and VO – ESAC – Villafranca del Castillo – 22 Mar 2007. 3D Spectroscopy in the Virtual Observatory: Current Status. Igor Chilingarian (Observatoire de Paris, France/SAI MSU, Russia) Ivan Zolotukhin (SAI MSU, Russia)

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3D Spectroscopy in the Virtual Observatory: Current Status

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  1. Spectroscopy and VO – ESAC – Villafranca del Castillo – 22 Mar 2007 3D Spectroscopy in the Virtual Observatory:Current Status Igor Chilingarian (Observatoire de Paris, France/SAI MSU, Russia) Ivan Zolotukhin (SAI MSU, Russia) Francois Bonnarel, Mireille Louys, Pierre Fernique, Thomas Boch (CDS, France) Pierre Le Sidaner, Frederic Royer, Isabelle Jegouzo (Observatoire de Paris)

  2. 3 Cornerstones for 3D data in VO 1. Data Model 2. Data Access Services 3. Client Applications

  3. Characterisation DM The basic part of the most general data model: Observation DM Provides a physical characterisation of a dataset

  4. CharacterizationAxis[ucd=pos]/Coverage/Location CharacterizationAxis[ucd=pos]/Resolution/RefVal CharacterizationAxis[…]/SamplingPrecision/RefVal CharacterizationAxis[ucd=pos]/Coverage/Bounds/CharBox Characterising IFU datasets Only first two levels (Location/Ref.Value and Bounds) should be provided for the whole dataset

  5. 3 Cornerstones for 3D data in VO 1. Data Model 2. Data Access Services 3. Client Applications

  6. Storing 3D Data in FITS • Pure 3D data cube (for IFP data and for some IFU) • 2D-image (one spectrum per row) + binary table  Euro3D Format • Euro3D Format • FITS binary data table: one row per spectrum • Binary table describing shape of spatial elements (“spaxels”) • Some mandatory metadata, including: common spectral WCS for all spectra, common spatial WCS for all spatial elements, meteo parameters during the observations, etc.

  7. 1. Giraffe Archive at ObsPM • Delivery of Euro3D FITS format and “stacked spectra” for reduced observations made with FLAMES/Giraffe at ESO VLT in MEDUSA mode (multi-object spectroscopy) (see poster by Royer et al.) • SSAP access to spectra individual objects (extracted fibers) • More data (IFU/ARGUS) are coming…

  8. 2. ASPID-SR at SAO RAS • Direct querying of the Characterisation DM metadata stored in PostgreSQL database with native XML support using SQL+XPath (see poster by Louys et al.) • SSAP interface on top of it • Delivery of Euro3D FITS + 3D FITS cubes for ~600 datasets including ~100 MPFS IFU datasets, ~70 IFP data cubes, long slit spectra (the rest) • WEB-2.0 interface • Highest possible integration of the archive WEB-site with existing VO client applications

  9. 3 Cornerstones for 3D data in VO 1. Data Model 2. Data Access Services 3. Client Applications

  10. VO-Paris Euro3D Client • Open source tool, Java 5+ • Available as applet and Java WebStart • I/O of Euro3D FITS files (local or URL) • Extraction of spectra for individual fibers • Export of extracted spectra in the VOTable serialization of the IVOA Spectral DM 1.0 • Export of the catalogue of fiber positions as VOTable 1.1 • Communication with CDS Aladin and ESA VOSpec using PLASTIC messages for data visualisation http://vo.obspm.fr/tools/Euro3D/

  11. Summary Our implementation is yet rather simple, however it demonstrates how existing VO standards and tools can be integrated to provide access to complex datasets

  12. PLASTIC-aware ASPIDApplet Load DSS Image Load Euro3D File Extract & Display Spectrum Show Fiber Positions Select Fiber(s) How this all works… (ASPID-SR) PLASTIC hub

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