Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105.1016k&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 691, p. 1016-1021.
Astronomy and Astrophysics
Astronomy
8
Disk Galaxies, Galactic Bulge, Galactic Evolution, Galactic Rotation, Hubble Constant, Absorption Spectra, Angular Momentum, Counter Rotation, Line Spectra
Scientific paper
Galactic absorption-line spectra can now yield valuable information about the internal kinematics beyond the classical measures of mean velocity and (Gaussian) velocity dispersion. An application of a new algorithm to the photometrically normal disk galaxy NGC 7217 has revealed that around 30 percent of the stars circulate in the opposite sense to the majority. The subtle serendipitous nature of the discovery raises the possibility that this situation may not be uncommon. NGC 7217 and the previously discovered case of NGC 4550 point towards substantial secondary infall of material with variable angular momentum and suggest a possible explanation of the decrease of bulge-to-disk ratio with strengthening spiral structure along the Hubble sequence.
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