A model for radiogalaxies

hrough a convenient model, it is shown that galaxies with a condensed nuclear body breaking in two pieces develop transient annular optical structures resembling those found in typical radiogalaxies. A complete account of the theory will be found in: — J. L . Sersic: Transient Annular Structures in Exploding Galaxies, Proc. Symposium on Stability, Resonances and Periodic Orbits, Sao Paulo, 1969 (in Press).Asociación Argentina de Astronomí

Unstable groups of galaxies

The observed relationship between mass-luminosity ratios for groups and clusters of galaxies and their population is interpreted on basis of a model developed by the author (1968) in which unstable groups of galaxies are thought to be the result of the fragmentation of a parent galaxy.Asociación Argentina de Astronomí

A model for radiogalaxies

hrough a convenient model, it is shown that galaxies with a condensed nuclear body breaking in two pieces develop transient annular optical structures resembling those found in typical radiogalaxies. A complete account of the theory will be found in: — J. L . Sersic: Transient Annular Structures in Exploding Galaxies, Proc. Symposium on Stability, Resonances and Periodic Orbits, Sao Paulo, 1969 (in Press).Asociación Argentina de Astronomí

A new dwarf member of the local group

Se describe un nuevo objeto, posiblemente una galaxia enana, o un cúmulo globular intergaláctico hallado en la constelación de Reticulum sobre placas de la colección Maksutov del Departamento de Astronomía de la Universidad de Chile.Asociación Argentina de Astronomí

Unstable groups of galaxies

The observed relationship between mass-luminosity ratios for groups and clusters of galaxies and their population is interpreted on basis of a model developed by the author (1968) in which unstable groups of galaxies are thought to be the result of the fragmentation of a parent galaxy.Asociación Argentina de Astronomí

The pavo triplet of galaxies

Con los datos fotométricos de Córdoba y espectroscópicos de Radcliffe se discute la estabilidad del grupo, llegándose a la conclusión de que se expande. Se hace notar la trascendencia de la escala de distancia en el cálculo de las masas.With the photometric data from Córdoba and the spectroscopic data from Radcliffe the stability-of the group is discussed. The conclusion is that the group expands. The influence of the distance upon the calculation of the masses is stressed.Asociación Argentina de Astronomí

A new dwarf member of the local group

Se describe un nuevo objeto, posiblemente una galaxia enana, o un cúmulo globular intergaláctico hallado en la constelación de Reticulum sobre placas de la colección Maksutov del Departamento de Astronomía de la Universidad de Chile.Asociación Argentina de Astronomí

A model for radiogalaxies

hrough a convenient model, it is shown that galaxies with a condensed nuclear body breaking in two pieces develop transient annular optical structures resembling those found in typical radiogalaxies. A complete account of the theory will be found in: — J. L . Sersic: Transient Annular Structures in Exploding Galaxies, Proc. Symposium on Stability, Resonances and Periodic Orbits, Sao Paulo, 1969 (in Press).Asociación Argentina de Astronomí

Unstable groups of galaxies

The observed relationship between mass-luminosity ratios for groups and clusters of galaxies and their population is interpreted on basis of a model developed by the author (1968) in which unstable groups of galaxies are thought to be the result of the fragmentation of a parent galaxy.Asociación Argentina de Astronomí

The pavo triplet of galaxies

Con los datos fotométricos de Córdoba y espectroscópicos de Radcliffe se discute la estabilidad del grupo, llegándose a la conclusión de que se expande. Se hace notar la trascendencia de la escala de distancia en el cálculo de las masas.With the photometric data from Córdoba and the spectroscopic data from Radcliffe the stability-of the group is discussed. The conclusion is that the group expands. The influence of the distance upon the calculation of the masses is stressed.Asociación Argentina de Astronomí