A 21-cm study of the Seyfert galaxy NGC 4151

Astronomy and Astrophysics – Astrophysics

Scientific paper

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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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