Inclinations and axial ratios of spiral and irregular galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Structure, Irregular Galaxies, Spiral Galaxies, Bodies Of Revolution, Dwarf Galaxies, Inclination, Local Group (Astronomy), Spheroids

Scientific paper

Among galaxies with redshifts ≤500 km s-1 spirals are found to have random orientations, wheras irregulars exhibit a highly significant excess of objects with 30° < i < 60°. This effect may be explained by assuming that irregular galaxies are not well represented by spheroids of revolution with an intrinsic flattening of 0.2, which is the value that is generally used to calculate the inclinations of such objects. The observations suggest that typical dwarf irregular galaxies are triaxial objects with axis ratios of 1.0:0.9:0.4.

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