Vertical motions in the galaxies NGC 3938 and NGC 628

Details Vertical motions in the galaxies NGC 3938 and NGC 628 Vertical motions in the galaxies NGC 3938 and NGC 628

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215..555f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 215, Aug. 1, 1985, p. 555-565. Research supported by Un

Astronomy and Astrophysics

Astronomy

6

Galactic Rotation, Hydrogen Clouds, Spiral Galaxies, Velocity Distribution, Vertical Motion, Data Reduction, Fourier Transformation

Scientific paper

Evidence is presented for vertical motions - perpendicular to the plane - in spiral galaxies of the ScI type. This evidence comes from a study of the H Ι velocity fields in two face-on galaxies, NGC 3938 and NGC 628. After removal of the circular rotation components, motions are found to be present which the authors interpret as vertical. This result is borne out by a quantitative analysis of the residual velocity fields using a Fourier transform. The patterns found for the vertical motions are a ring and a spoke in NGC 3938, and a weak spiral in NGC 628.

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