Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85..824g&link_type=abstract
Astronomical Journal, vol. 85, July 1980, p. 824-835.
Astronomy and Astrophysics
Astronomy
19
Barred Galaxies, Galactic Structure, H Lines, Hydrogen Clouds, Stellar Evolution, Astronomical Photography, High Resolution, Ionized Gases, Radio Interferometers, Star Formation Rate, Stellar Luminosity, Velocity Distribution
Scientific paper
The late-type barred spiral NGC 925 has been observed with the line interferometer of the National Radio Astronomy Observatory. An angular resolution of 62 x 31 arcsec was achieved with a velocity resolution of 24.5 km/s. The neutral hydrogen distribution is found to correlate well with the optical structure. The bright star formation rate is found to be proportional to the H I surface density raised to the 2.35 power. Noncircular motions are observed in the direction of the spiral arms of the galaxy and are compatible with density wave expectations. In addition, the velocity gradient along the bar is substantially less than that found immediately beyond the bar. The thickness of the disk may be about 160 pc at a radial distance of 18 kpc if the distance to the galaxy is 14 Mpc.
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