Gas in the nucleus of the Seyfert galaxy NGC 4151

Details Gas in the nucleus of the Seyfert galaxy NGC 4151 Gas in the nucleus of the Seyfert galaxy NGC 4151

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983afz....19...17p&link_type=abstract

(Astrofizika, vol. 19, Jan.-Mar. 1983, p. 17-28) Astrophysics (ISSN 0571-7132), vol. 19, no. 1, July 1983, p. 7-14. Translation.

Astronomy and Astrophysics

Astrophysics

1

Galactic Nuclei, Galactic Rotation, Interstellar Gas, Seyfert Galaxies, Angular Resolution, Gas Density, Line Spectra, Rotating Disks

Scientific paper

The profiles of the O III forbidden line and other forbidden lines in the spectrum of the nucleus of NGC 4151, obtained using the 6 m telescope of the Special Astrophysical Observatory of the USSR Academy of Sciences, are determined in order to study the nature of the motion of the gas, the shape of the gas formation, and the density of the gas in the nucleus of this galaxy. Results show that there is a rotating gas disk less than or approximately 3 arcsec in dimension in the nucleus of NGC 4151 whose density increases toward the center of the galaxy. The linear rotation velocity is found to vary weakly with the radius and is about 300 km/sec. In the center of the disk, a bright gaseous formation is observed which has a diameter less than the angular resolution and is responsible for the rotation of the main central maximum of the forbidden lines. The velocity in the center of the disk probably does not exceed 100-150 km/sec. The Ne III 3869 forbidden line is found to indicate the presence around the nucleus of a faint gaseous corona.

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