Other
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...74..389b&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 74, Oct. 1990, p. 389-436.
Other
54
Astronomical Spectroscopy, Emission Spectra, Nebulae, Radio Galaxies, Visible Spectrum, Galactic Nuclei, Galactic Rotation, H Alpha Line, H Ii Regions
Scientific paper
Results are presented on an extensive program of long-slit spectroscopy of the extended emission-line regions around 19 radio galaxies. Measurements, carried out at multiple position angles, were obtained with the Ritchey-Chretien spectrograph on NOAO's 4-m Mayall telescope at Kitt Peak. In general, no strong gradients in the H-alpha to the forbidden N II line were found within a source. In some sources, the gas appeared to be in rotation about the galaxy nucleus, with measured rotational velocities ranging from 100 to 325 km/sec. Frequently, the rotation curves appeared to be asymmetrically situated with respect to the nuclear line-emitting gas, showing offsets of about 60 km/sec, with respect to the nuclear gas. In other sources no evidence for rotation was found for the near nuclear emission-line gas, but the velocities of the gas farther out were positive on one side of the nucleus and negative on the other.
Baum Stefi A.
Breugel Wil van
Heckman Timothy
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