Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..581v&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Other
Scientific paper
The two major extragalactic data bases in the world are NED and the 3 services SIMBAD/VIZIER/ALADIN at the CDS. Whereas NED is exclusively extragalctic, the CDS services also include galactic objects except for objects of the solar system. Both data bases allow to find astronomical objects via their names or positions. They provide positions, radial velocities, bibliographic references, and images (jpeg or FITS) for these objects. There is the possibility to search objects on a defined region on the sky by using constraints on their radial velocities or luminosities at a given wavelength. NED is a very rich data base. It contains many links towards external archives and provides compiled flux measurements over the whole wavelength range from which an SED is derived. Whereas NED has a rather static architecture, the CDS services are more flexible. The SIMBAD astronomical database provides basic data, cross-identifications and bibliography for astronomical objects outside the solar system. VIZIER provides access to the most complete library of published astronomical catalogues and data tables available on line, organized in a self-documented database. ALADIN is an interactive software sky atlas allowing the user to visualize digitized images of any part of the sky, to superimpose entries from astronomical catalogs or personal user data files. The great advantage of the CDS services is their interoperability, i.e. the three services communicate with each other. For example, one can search for an object in SIMBAD, visualize its position and make an overlay with a DSS image within ALADIN. VIZIER catalogues can be queried using various constraints on the entry columns. The results can be directly displayed on the sky and superimposed on an astronomical image within ALADIN. ALADIN has its own image data base, but it has also access to NED and many major archives and image data bases. This interoperability gives the CDS services a great flexibility, which will allow them to respond efficiently to the requirements of the virtual observatory.
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