LEDA Database for physics of galaxies

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About the LEDA Database for physics of galaxies

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LEDA provides a database of galaxies.

HyperLeda is an information system for astronomy: It consists in a database and tools to process that data according to the user's requirements. The scientific goal which motivates the development of HyperLeda is the study of the physics and evolution of galaxies.

LEDA was created more than 20 years ago, in 1983, and became HyperLeda after the merging with Hypercat in 2000. At present the database contains over 3 million objects, out of them 1.5 million are certainly galaxies (with a high level of confidence). See the distribution of the galaxies on the sky. Since 2003, HyperLeda is distributed as part of MIGALE.

HyperLeda is now developed in the general frame of the Virtual Observatory, a concept by which astronomers around the world will have access to any kind of data available in the web on their desks. Users will submit queries which will transparently extract and process data from different servers throughout the world and return the result in an standardized form.

The Virtual Observatory and HyperLeda are also of a major interest for education and popularization of astronomy.

Access the Data

http://leda.univ-lyon1.fr/

Contents of the Data

The database is build around several compilations which are then used to produce and homogeneous description of the galaxies. This homogenization consists in converting the original measurements to a standard scale, to reject wrong measurements and to compute a representative average.

List of compilations

Number - Description

  • 0-General index
  • 1-Central velocity dispersion
  • 2-Maximum velocity of rotation of the stars
  • 3-Aperture photometry
  • 4-Integrated photometry
  • 5-Spatially resolved kinematics
  • 6-Line strength indice Mg2
  • 7-Distance of nearby galaxies
  • 8-Cross identifications
  • 9-1D kinematical data
  • 10-1D line strength
  • 11-Fits Archive
  • 101-Designations
  • 102-Morphology
  • 103-Position angle
  • 106-Size
  • 107-Magnitudes
  • 108-Maximum velocity of rotation of the gas
  • 109-Nuclear activity classification
  • 110-Heliocentric cz
  • 112-Colors
  • 113-Astrometry
  • 115-Physical nature