Studies of nearly face-on spiral galaxies. II - H I synthesis observations and optical surface photometry of NGC 628

Details Studies of nearly face-on spiral galaxies. II - H I synthesis observations and optical surface photometry of NGC 628 Studies of nearly face-on spiral galaxies. II - H I synthesis observations and optical surface photometry of NGC 628

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...132...20s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 132, no. 1, March 1984, p. 20-32.

Astronomy and Astrophysics

Astrophysics

137

Galactic Structure, Hydrogen Clouds, Mass To Light Ratios, Radial Velocity, Radio Galaxies, Spiral Galaxies, Astronomical Photometry, Brightness Distribution, Data Simulation, Galactic Rotation, H Lines, Mass Distribution, Star Formation Rate

Scientific paper

The authors present H I synthesis and three-colour optical surface photometry observations of the nearly face-on ScI spiral NGC 628 (M74). They deduce: (1) The H I is seen to be much more extended than the light distribution. (2) The H I shows spiral structure out to the edge of the observed extent and correlates in position with the optical spiral structure. (3) The velocity field out to the optical edge can be ascribed to circular rotation. (4) Beyond the optical edge the plane of the H I undergoes a smooth variation in inclination and a rather abrupt change of ≡90° in the line of nodes. (5) The H I velocity dispersion drops from 9 - 10 km s-1 in the inner region to about 7 - 8 km s-1 near the optical edge. It is correlated with surface density. (6) The disk has an exponential optical surface brightness profile in the three colours and a small or non-existent change in colour index. (7) Inside the edge 30 - 50% of the disk mass is in the form of H I.

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