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Found 2 result(s)

LEDAS

LEicester Database and Archive Service

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The Leicester Database and Archive Service (LEDAS) is an easy to use on-line astronomical database and archive access service, dealing mainly with data from high energy astrophysics missions, but also providing full database functionality for over 200 astronomical catalogues from ground-based observations and space missions. The LEDAS also allows access to images, spectra and light curves in graphics, HDS and FITS formats, as well as access to raw and processed event data. LEDAS provides the primary means of access for the UK astronomical community to the ROSAT Public Data Archive, the ASCA Public Data Archive and the Ginga Products Archive by its Archive Network Interface ARNIE.

Virgo Millenium Database

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When published in 2005, the Millennium Run was the largest ever simulation of the formation of structure within the ΛCDM cosmology. It uses 10(10) particles to follow the dark matter distribution in a cubic region 500h(−1)Mpc on a side, and has a spatial resolution of 5h−1kpc. Application of simplified modelling techniques to the stored output of this calculation allows the formation and evolution of the ~10(7) galaxies more luminous than the Small Magellanic Cloud to be simulated for a variety of assumptions about the detailed physics involved. As part of the activities of the German Astrophysical Virtual Observatory we have created relational databases to store the detailed assembly histories both of all the haloes and subhaloes resolved by the simulation, and of all the galaxies that form within these structures for two independent models of the galaxy formation physics. We have implemented a Structured Query Language (SQL) server on these databases. This allows easy access to many properties of the galaxies and halos, as well as to the spatial and temporal relations between them. Information is output in table format compatible with standard Virtual Observatory tools. With this announcement (from 1/8/2006) we are making these structures fully accessible to all users. Interested scientists can learn SQL and test queries on a small, openly accessible version of the Millennium Run (with volume 1/512 that of the full simulation). They can then request accounts to run similar queries on the databases for the full simulations. In 2008 and 2012 the simulations were repeated.