The global TAP schema collects information on
tables and columns from known TAP servers. This facilitates locating
queriable data by physics (via UCD) or keywords (via description).
Note that this shouldn't really be necessary as all information
present here should be exposed through Registry records. However,
in reality data providers currently are much more liable to give
column metadata in their tap_schema than in their Registry records.
Hence, for the time being, we maintain this service by harvesting
tap_schemas about monthly.
Operators of publishing registries
can use this service to request a re-harvest of their registry by pasting
in their registry's IVOID below. If you paste in the magic value
``ivo://ivoa.net/rofr``, we will also fetch new registries from the
RofR.
You usually want to use this when you want to see the effect of some
change in your registry on, say, TOPCAT. Note that you cannot start
a full re-harvest of a registry from this interface. Contact the
operators if you think you need that.
Identifying Brown Dwarf candidates in 2MASS and SDSS
Date:
03 Apr 2025 09:45:51
Publisher:
The GAVO DC team
Description:
This tutorial is a comprehensive scientific usecase in which brown
dwarf candidates in 2MASS and SDSS are identyfied. The surveys are
queried using ADQL, and unncertainties in the data are solved with
TOPCAT and Aladin.
Introduction to Simulation Databases - Density Fields and Dark Matter
Halos
Date:
04 Apr 2025 09:05:08
Publisher:
The GAVO DC team
Description:
This tutorial was created for a physics teacher workshop (~ high
school level). It shows how to extract density fields and information
on dark matter halos from the CosmoSim database using SQL queries. It
is optimized for brevity.
Introduction to Simulation Databases Using CosmoSim
Date:
04 Apr 2025 09:05:08
Publisher:
The GAVO DC team
Description:
This tutorial shows how to do first SQL-queries on cosmological
databases, including retrieving mass functions, extracting merger
trees or particles of a specific dark matter halo.
Multi-instrument, multi-wavelength study of high energy sources with
the Virtual Observatory
Date:
27 Dec 2024 08:31:04
Publisher:
The GAVO DC team
Description:
This tutorial demonstrates how to use several standard tools of the
Virtual Observatory (VO) for data mining and multiple waveband data
analysis. The step-by-step application below focuses on towards
applications in the gamma-ray and high energy domain, but also
involves observational data from other wavebands.
Outlier Analysis in Low-Resolution Spectra: DFBS and Beyond
Date:
27 Dec 2024 08:31:06
Publisher:
The GAVO DC team
Description:
Low-resolution spectra like those resulting from objective prism
observations or the RP/BP instrument on board of the Gaia astrometry
satellite enable a wealth of interesting science. This use case
investigates one use leading up to combining many VO resources: The
identification of misclassified objects from reference databases.
Within this use case you learn about motion of the planets both
around the Sun and in the sky, planetary conjunctions and what might
have been the Star of Bethlehem.
Within this use case you learn about Kepler's laws, a cornerstone of
astronomy and a fundamental brick of both Newton's and Einstein's
theories of gravitation. This use case is complemented by use cases 10
and 16 (at different levels of difficulty.