H I studies of the Sculptor group galaxies. II - NGC 7793

Details H I studies of the Sculptor group galaxies. II - NGC 7793 H I studies of the Sculptor group galaxies. II - NGC 7793

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..394c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Aug. 1990, p. 394-402. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

61

Dark Matter, Galactic Mass, H I Regions, Interstellar Gas, Very Large Array (Vla), Halos, Mass Distribution, Milky Way Galaxy, Velocity Distribution

Scientific paper

Data from radio observations of NGC 7793, obtained in the 21-cm line of H I using the C/D configuration of the VLA during October 1985, are presented in graphs and maps and characterized in detail. Parameters determined include H I disk size 1.5 times the optical diameter, total H I mass 6.8 x 10 to the 8th solar masses, system velocity 227 km/sec, inclination 47 deg, position angle varying from about 290 to about 305 deg from r = 5 to r = 7.5 arcmin, and V(rot) decreasing from a maximum of 116 km/sec at r = about 4 arcmin to 88 km/sec at r = 7.5 arcmin. It is found that a kinematical model including a small (r = 2.7 kpc) centrally concentrated (rho0 = 0.04 solar mass/cu pc) dark-matter halo with a mass distribution like that of H I is best able to explain the observed rotation curve.

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