A 21-cm study of the Seyfert galaxy NGC 4151

Details A 21-cm study of the Seyfert galaxy NGC 4151 A 21-cm study of the Seyfert galaxy NGC 4151

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....57...97b&link_type=abstract

Astronomy and Astrophysics, vol. 57, no. 1-2, May 1977, p. 97-104.

Astronomy and Astrophysics

Astrophysics

53

Galactic Structure, H Lines, Radio Emission, Seyfert Galaxies, Spatial Distribution, Astronomical Maps, Hydrogen Atoms, Superhigh Frequencies, Velocity Distribution

Scientific paper

Observations in the 21-cm H I line are reported for the Seyfert galaxy NGC 4151. No H I is seen in absorption in front of the nucleus except a possible weak narrow feature which may be H I in the disk. The H I emission distribution has been mapped with 60-arcsec resolution, and the velocity field determined. The velocities from 1 to 5 arcmin from the center are consistent with pure rotation and a dynamical major axis in position angle 19 deg. This supports the conclusion that the central dominant structure is a thick bar. The H I distribution is coincident with the faint outer optical arms.

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