Surface photometry of the spiral galaxy NGC 4501

Details Surface photometry of the spiral galaxy NGC 4501 Surface photometry of the spiral galaxy NGC 4501

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112..235s&link_type=abstract

Astronomy and Astrophysics, vol. 112, no. 2, Aug. 1982, p. 235-240.

Physics

Optics

4

Astronomical Photometry, Galactic Rotation, Spiral Galaxies, Astronomical Maps, Brightness, Calibrating, Data Reduction, Geometrical Optics, Luminosity, Photographic Plates

Scientific paper

A calibrated photographic blue plate of the spiral galaxy NGC 4501 has been analyzed by numerical procedures to determine the isophotes and geometrical parameters, equivalent luminosity profile and integrated parameters, axis luminosity profiles, and rotation curve. The profiles are decomposed into disk, spheroid, and spiral arm components to give their separate parameters. The anticipated flat rotation curve could not even approximately be reproduced, ruling out any derivation of M/L ratios. Possible implications are the presence of a massive dark component or the theory of increasing M/L in spiral disks.

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