Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pazh...17..321k&link_type=abstract
Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 17, April 1991, p. 321-330. In Russian. In Russian. In Russian.
Astronomy and Astrophysics
Astronomy
5
H Alpha Line, Hydrogen Ions, Light Curve, Rotational Spectra, Spectral Line Width, Spiral Galaxies, Galactic Structure, Sky Surveys (Astronomy)
Scientific paper
Rotation curves, V(R), are presented for 41 northern sky galaxies having angular diameters greater than 2 arcmin and apparent axial ratios greater than 7. The data were obtained with the CCD spectrograph of the OHP 193-cm telescope. More than 90 percent of the rotation curves have a nondecreasing shape, and about a quarter of them may be classified as wave-like. It is inferred that the existence of the latter type and also some observed cases of strong asymmetry of V(R) are caused by inhomogeneous light absorption within a plane of spiral arms for the galaxies studied. The optical rotation curve amplitude exhibits a tight correlation with the 21-cm line width. Individual galaxy-to-galaxy differences of the distribution of neutral and ionized hydrogen as well as light absorption fluctuations cause a total relative scatter of 6 percent. This allows the H-alpha rotation curves to be used for flat galaxies as a means for determining their distances by analogy with the Tully-Fisher relation.
Karachentsev Igor D.
Zhou Xu
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