V-R diagram for spiral galaxies - New insights into the Hubble sequence

Details V-R diagram for spiral galaxies - New insights into the Hubble sequence V-R diagram for spiral galaxies - New insights into the Hubble sequence

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.157..321p&link_type=abstract

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno

Astronomy and Astrophysics

Astrophysics

3

Galactic Structure, Hubble Diagram, Spiral Galaxies, Astrophysics, Galactic Rotation

Scientific paper

The present examination of the relation between the global parameters of spiral galaxies and their morphological type represents rotational velocity V at 25 mag/sq arcsec radius against this radius R for a 56-galaxy sample. Isolines of total mass, angular momentum, and mean surface density, plotted above the V-R diagram for isolated galaxies with circular motion in centrifugal equilibrium, indicate that morphological type is represented by mean surface density, V-squared/R. Taking V-squared/R as representative of morphological type, the empirical Tully-Fisher relation and the dependence of the slope and the zero point on the morphological type can be theoretically deduced. For every galaxy morphological type, there is a critical mass above which a dynamical behavior change occurs.

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