Lyons Groups of Galaxies (or LGG) is an

astronomical catalog An astronomical catalog or catalogue is a list or tabulation of astronomical objects, typically grouped together because they share a common type, morphology, origin, means of detection, or method of discovery. The oldest and largest are star c ...

of nearby groups of galaxies complete to a limiting

apparent magnitude Apparent magnitude () is a measure of the brightness of a star or other astronomical object observed from Earth. An object's apparent magnitude depends on its intrinsic luminosity, its distance from Earth, and any extinction of the object's ...

B0=14.0 with a

recession velocity Recessional velocity is the rate at which an extragalactic astronomical object recedes (becomes more distant) from an observer as a result of the expansion of the universe. It can be measured by observing the wavelength shifts of spectral lines ...

smaller than 5,500 km/s. The catalogue was obtained from the

Lyon-Meudon Extragalactic Database The Lyon-Meudon Extragalactic Database (LEDA) was a database of galaxies, created in 1983 at the Lyon Observatory Lyon Observatory is located in Saint-Genis-Laval, a commune in the Rhône department in eastern France, near Lyon. Founded in 187 ...

. Two methods were used in group construction: a percolation method derived from Huchra and Geller and a hierarchical method initiated by R. Brent Tully. The catalog is a synthesized version of the two results. The LGG includes 485 groups and 3,933 member galaxies.

References

External links

LGG description at CDS

Full LGG list of records at CDS

ADS: General study of group membership. II - Determination of nearby groups
Astronomical catalogues of galaxy clusters {{galaxy-stub

See also

References

External links