Amplitudes of the rotation curves of edge-on galaxies from optical and radio data

Details Amplitudes of the rotation curves of edge-on galaxies from optical and radio data Amplitudes of the rotation curves of edge-on galaxies from optical and radio data

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..445m&link_type=abstract

Astronomy Letters, Volume 23, Issue 4, July 1997, pp.445-449; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 509

Astronomy and Astrophysics

Astronomy

16

Scientific paper

The rotation curves are presented for thirty northern-sky galaxies with an axial ratio a/b > 7 from the new Flat Galaxy Catalog (Karachentsev et al. 1993). The data were obtained with the 6-m Special Astrophysical Observatory telescope. The typical rotation curve, which was constructed from the Hα line, reaches 0.8 of the standard galaxy radius R_25. The amplitude of the optical rotation curve, V_max, shows a close correlation with the width of the 21-cm line, W_50. Individual differences in the distribution of neutral and ionized hydrogen in the galaxy disks and absorption fluctuations in them produce a total scatter in the {V_max , W_50} dia gram within 6-7 km s^-1. The optical rotation curves can thus be used to determine the distances to flat galaxies from an analogue of Tully-Fisher's relation.

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