Neutral hydrogen observations of double-spiral galaxies. I - NGC 5905 and NGC 5908

Details Neutral hydrogen observations of double-spiral galaxies. I - NGC 5905 and NGC 5908 Neutral hydrogen observations of double-spiral galaxies. I - NGC 5905 and NGC 5908

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107...66v&link_type=abstract

Astronomy and Astrophysics, vol. 107, no. 1, Mar. 1982, p. 66-74. Research supported by the Nederlandse Organisatie voor Zuiver

Astronomy and Astrophysics

Astronomy

37

Hydrogen, Mass To Light Ratios, Neutral Gases, Radio Astronomy, Spiral Galaxies, Emission Spectra, Galactic Rotation, Galactic Structure, Line Spectra, Spectral Energy Distribution, Spectrum Analysis, Telescopes

Scientific paper

Westerbork 21-cm neutral hydrogen observations for the NGC 5905 and 5908 are used to derive a rotation curve and corresponding masses. The masses are compared with the minimum mass following from the observed motion of the pair in orbit. Spherical and flat distributions of matter lead to the greatest differences in total mass derived from the rotation curve when the rotation curve is flat or increasing from a certain radius R0. A flat rotation curve gives a 25% lower mass for a disk model than for a spherical one and results of the flat disk approximation are given.

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