OBSERVATIONS OF THE VELOCITY-FIELD OF NGC-4051

Observations of the velocity field of the Seyfert galaxy NGC 4051 were made using 1.88 m reflector of Okayama Astrophysical Observatory. For 106 H II and nuclear regions in 17 long-slit spectra (P,A. =110 degre es) which covered almost an entire optical image of similar to 3'x3', we measured H alpha to present the velocities in tabular form. The emi ssion region is rather annular, and the observed H alpha velocities ar e gradually increasing with distance from the center to a radius of si milar to 90'' with no maximum or hat part. Analyses give V-h = 697 +/- 11 km s(-1) and phi = 130 degrees +/- 14 degrees for the heliocentric systemic velocity and the major axis position angle, respectively. Co mparison shows that the H alpha velocity structure is consistent with the Hr observations of Liszt & Dickey (1995, AJ, 110, 998). However, t he rotation curve corrected for the galaxy inclination (i = 37 degrees ) is different from any of the synthetic rotation curves of Rubin et a l. (1985, ApJ, 289, 81) both in the form of rotation curve and in the absolute magnitude of galaxies. (C) 1997 American Astronomical Society .