Optical spectroscopy of the oval distortion in NGC 4151

Details Optical spectroscopy of the oval distortion in NGC 4151 Optical spectroscopy of the oval distortion in NGC 4151

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143...29s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 1, Feb. 1985, p. 29-34.

Astronomy and Astrophysics

Astrophysics

14

Astronomical Spectroscopy, Barred Galaxies, Galactic Structure, Gas Streams, Optical Emission Spectroscopy, Seyfert Galaxies, Data Reduction, Galactic Nuclei, Gravitational Effects, H Ii Regions, Ionized Gases, Line Spectra, Radial Velocity

Scientific paper

Image tube spectra have been obtained from emission line regions within the bar of NGC 4151 at about 1 arcmin distance from the nucleus. The line widths of 50 + or - 30 km/s, the electron densities N(e) of less than 500/cu cm, and the appearance on photographs of different color suggest that these regions are normal H II regions. Significant radial streaming motions (about 20 km/s) of the H II regions are detected after constraining the circular velocities (of about 150 km/s) by 21-cm-data. The velocity vectors are interpreted by oval streamlines of the gas which are caused by the gravitational potential of the bar. This is in agreement with earlier conclusions from radio data by Bosma (1978). Finally, some morphological peculiarities in the bar of NGC 4151 are emphasized.

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