A new look at the Hubble diagram

Details A new look at the Hubble diagram A new look at the Hubble diagram

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976s%26t....51...83l&link_type=abstract

Sky and Telescope, vol. 51, Feb. 1976, p. 83-87.

Astronomy and Astrophysics

Astronomy

1

Galactic Evolution, Hubble Diagram, Quasars, Red Shift, Spatial Distribution, Astronomical Maps, Cosmology, Radial Velocity, Radio Galaxies, Universe

Scientific paper

Information about Hubble's (1929) velocity-distance relationship for galaxies is reviewed, and formulas are given for extending this relationship to include QSOs and radio galaxies. Using these formulas, a Hubble diagram is prepared for 663 normal galaxies, 230 radio galaxies, and 265 QSOs. The absolute visual magnitude for each class of object is calculated, and it is found that QSOs are the most luminous objects, radio galaxies are next, and normal galaxies are the least luminous. It is also found that the three types generally occupy discrete sections of the diagrams and that the slopes of the lines for each class are consistent with a homogeneous isotropic and expanding universe. It is concluded that QSO evolve into weaker radio galaxies and that the latter, in turn, evolve into normal galaxies.

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