The distribution of interstellar matter in the Scd galaxy NGC 6946. I - The neutral hydrogen disk

Details The distribution of interstellar matter in the Scd galaxy NGC 6946. I - The neutral hydrogen disk The distribution of interstellar matter in the Scd galaxy NGC 6946. I - The neutral hydrogen disk

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308..600t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. 600-610.

Astronomy and Astrophysics

Astronomy

107

Density Distribution, Galactic Evolution, Hydrogen, Interstellar Matter, Neutral Gases, Spiral Galaxies, Astronomical Maps, Gas Dynamics, Molecular Gases, Radio Sources (Astronomy), Star Formation

Scientific paper

H I observations of the luminous Scd galaxy NGC 6946 obtained at the VLA in the D configuration are presented. Detectable H I emission is observed out to a radius of 30 kpc. This emission exhibits a clumped structure on a scale of 2 kpc, with evidence for H I spiral structure in the outer disk. The velocity field in the central 2 arcmin exhibits a rotation relative to the position angle of the major axis further out in the disk, a characteristic often found in barred spiral galaxies. The distortions of 25 km/s in the velocity field of the disk are coincident with the H I and optical spiral arms. When compared to the optical, radio continuum, H-alpha, and molecular radial distributions of NGC 6946, it is found that the H I distribution is the only one which is definitely different from the rest. It is inferred that the atomic gas component plays only a passive role in the evolution of high-luminosity, late-type spiral galaxies.

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