Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1281g&link_type=abstract
Astronomical Journal, vol. 84, Sept. 1979, p. 1281-1292.
Astronomy and Astrophysics
Astronomy
9
Astronomical Photometry, Galactic Structure, Hydrogen Atoms, Interstellar Gas, Spiral Galaxies, Visual Observation, Brightness, Electrophotometry, Gas Density, Luminous Intensity, Mass, Ring Structures
Scientific paper
NGC 6902, originally classified as an early-type galaxy, is shown to be a high-luminosity (bolometric magnitude-21.8) Sb I galaxy. Integral properties are derived from photometric studies which include surface photometry from CTIO 4-m prime focus plates. In most respects NGC 6902 is a normal, luminous spiral, but there are two exceptions: (1) its H I content exceeds the mean for Sb galaxies by about a factor of 3; (2) the spiral pattern is disorganized and the arms have low brightness amplitude as compared with typical Sb I systems, a feature which seems characteristic of H I-rich spirals. NGC 6902 therefore is difficult to recognize as a high luminosity galaxy from its morphology, which might account for an apparent bias against the inclusion of gas-rich galaxies in samples of luminous spirals. Mechanisms which could produce a correlation between high gas content and low amplitude spiral arms are considered.
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