Observatons of the Velocity Field of NGC 4051

Details Observatons of the Velocity Field of NGC 4051 Observatons of the Velocity Field of NGC 4051

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114...94k&link_type=abstract

Astronomical Journal v.114, p.94

Astronomy and Astrophysics

Astronomy

7

Galaxies: Individual: Ngc 4051, Galaxies: Seyfert, Galaxies: Kinematics And Dynamics

Scientific paper

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°) which covered almost an entire optical image of ˜3'X3', we measured Hα to present the velocities in tabular form. The emission region is rather annular, and the observed Hα velocities are gradually increasing with distance from the center to a radius of ˜90" with no maximum or flat part. Analyses give Vh=697±11 km s-1 and φ=1300 ±14° for the heliocentric systemic velocity and the major axis position angle, respectively. Comparison shows that the Hα velocity structure is consistent with the H I observations of Liszt & Dickey (1995, AJ, 110, 998). However, the rotation curve corrected for the galaxy inclination (i=37°) is different from any of the synthetic rotation curves of Rubin et al. (1985, ApJ, 289, 81) both in the form of rotation curve and in the absolute magnitude of galaxies.

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