Illusionary WARPS in H I disks of nearly edge-on spiral galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Disks (Shapes), Galactic Structure, Hydrogen Clouds, Radio Sources (Astronomy), Spiral Galaxies, Astronomical Maps, Astronomical Photography, Computerized Simulation, Optical Illusion, Ultrahigh Frequencies, Warpage

Scientific paper

Warped neutral hydrogen disks that do not seem to be explainable by tidal interaction with other galaxies have recently been reported for three out of five nearly edge-on spiral galaxies. This paper proposes that illusionary warps in 21-cm observations of otherwise normal galaxies can be created by a nearly edge-on orientation and by the existence of H I spiral arms in the outer parts of the disks. It is also shown that illusionary warping in radio observations can be accentuated by a beamwidth mechanism analogous to the optical Stock (1955) effect, whereby the outward continuation of the spiral arms as they cross the major axis creates the illusion of a bend in that axis. Examples of the Stock effect in two warped edge-on isolated galaxies are examined along with a computer simulation of an illusionary warp produced by the Stock effect in a nearly edge-on galaxy.

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