Morphology of spiral galaxies. I - General properties

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Catalogs, Astronomical Photography, Galactic Structure, Spiral Galaxies, Angular Momentum, Brightness Distribution, Galactic Evolution, Image Processing, Inclination, Magnitude, Sky Surveys (Astronomy)

Scientific paper

Red Palomar Sky Survey plates are scanned to characterize a complete sample of 605 spiral galaxies north of declination -33 deg having inclination angle less than 56 deg and blue diameter 2-15 arcmin. The selection of the data and the reduction and parameter-extraction procedures are explained, and the data and the results of statistical analysis are presented in tables and graphs. Findings reported include a low frequency of occurrence for small inclination angles (suggesting distortion of outer structures), similar distributions of central disk brightness for types Sa-Sc but not for types Sd-Sm (where mean values are smaller), fewer late-type galaxies with large exponential-disk scale lengths, no galaxies with both high central brightness and large scale length (indicating a limit on angular momentum in galaxy formation), and a correlation between mean surface brightness and absolute magnitude for later-type galaxies but not for types Sa-Scd.

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