Spurious ``Resonances'' in Images of Grand Design Spiral Galaxies

Details Spurious ``Resonances'' in Images of Grand Design Spiral Galaxies Spurious ``Resonances'' in Images of Grand Design Spiral Galaxies

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9201s&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #92.01D; Bulletin of the American Astronomical Society, Vol. 24, p.1266

Astronomy and Astrophysics

Astronomy

Scientific paper

Decomposition of galactic images into modes with m-fold symmetry has been used to find the radii of resonances in the disk; a resonance is assumed to exists at a radius where the amplitude of the dominant mode (normally, m=2) is at a minimum and where there is a sudden shift in its phase. We show that simple artificial galaxies (in which the actual m=2 pattern is smooth) display features of exactly this sort if the decomposition is done after incorrect deprojection of the image, or using the wrong location for the center of the spiral pattern. The effect is sensitive to relatively small errors in both spatial orientation and centering (a few degrees and a fraction of a scale length, repsectively). We also discuss, briefly, the possibility that these same effects can be used to obtain more accurate values for the quantities in question.

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