The warped Sb-galaxy NGC 4565

Details The warped Sb-galaxy NGC 4565 The warped Sb-galaxy NGC 4565

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....89...95h&link_type=abstract

Astronomy and Astrophysics, vol. 89, no. 1-2, Sept. 1980, p. 95-99. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astronomy

2

Hydrogen Clouds, Neutral Gases, Spiral Galaxies, Hydrogen Atoms, Radio Telescopes, Sky Surveys (Astronomy), Warpage

Scientific paper

The distribution of the neutral hydrogen (H I) of the nearly edge-on-Sb-galaxy NGC 4565 has been observed with the 100 m radiotelescope. The H I extends to about twice the optical dimension (on the Palomar Observatory Sky Survey) being asymmetric like the optical galaxy. The H I-mass is asymmetric in the same sense with 20% more on the NW side than on the SE side of the galaxy. The H I distribution is symmetric to the first order; only in the outer part a considerable warp is observed reaching about 18 kpc at a distance of 100 kpc from the center. A flat rotation curve is compatible with the observations leading to a total mass of 10 to the 12th solar masses, the relative hydrogen content being 4%; M(H I)/L(B) equals 0.18, M(t)/L(B) equals 4.5. Thus the Sb galaxy NGC 4565 is among the largest (extent) and most massive of the relatively near spiral galaxies.

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