Abstract
view Abstract Citations (10) References (60) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Optical studies of H I-rich southern galaxies. I. The supergiant spiral NGC 6902. Gallagher, J. S. Abstract 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. Publication: The Astronomical Journal Pub Date: September 1979 DOI: 10.1086/112540 Bibcode: 1979AJ.....84.1281G Keywords: Astronomical Photometry; Galactic Structure; Hydrogen Atoms; Interstellar Gas; Spiral Galaxies; Visual Observation; Brightness; Electrophotometry; Gas Density; Luminous Intensity; Mass; Ring Structures; Astronomy; Neutral Hydrogen:Spiral Galaxies; Spiral Galaxies:Structure; Spiral Galaxies:Surface Photometry full text sources ADS | data products NED (1) Related Materials (1) Part 2: 1983AJ.....88...55G
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