Spectroscopic observations of H II regions in NGC 5128. I - Radial velocities

Details Spectroscopic observations of H II regions in NGC 5128. I - Radial velocities Spectroscopic observations of H II regions in NGC 5128. I - Radial velocities

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....93..248m&link_type=abstract

Astronomy and Astrophysics, vol. 93, no. 1-2, Jan. 1981, p. 248-254.

Astronomy and Astrophysics

Astrophysics

16

Astronomical Spectroscopy, Galactic Structure, H Ii Regions, Radial Velocity, Radio Galaxies, Elliptical Galaxies, Emission Spectra, Galactic Rotation, Hydrogen Ions, Kepler Laws, Line Spectra

Scientific paper

It is noted that image tube spectrograms of the radio galaxy NGC 5128 have been obtained with the European Southern Observatory's 1.52 m telescope and that the long slit of the spectrograph covered the dust lane in various orientations in order to get radial velocities of a number of H II regions. The measured velocities are consistent with a Keplerian rotation of the H II regions around the center of the galaxy, which supports the view that NGC 5128 consists of an elliptical component (old stars) and a fast rotating disk component (gas, dust, young stars, H II regions). The results are discussed in the context of other measurements and alternative theories about the nature of the dust lane.

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