Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979msngr..18....4m&link_type=abstract
ESO Messenger, Sept. 1979, p. 4-7.
Astronomy and Astrophysics
Astronomy
2
Astronomical Spectroscopy, H Ii Regions, Radio Galaxies, X Ray Sources, Absorption Spectra, Balmer Series, Forbidden Bands, Hydrogen Ions, Line Spectra, Spectrograms, Telescopes
Scientific paper
Results of observations of H II regions in the giant X-ray and radio galaxy NGC 5128 are presented. Emission nebulae with a typical diameter of 2 to 4 arcsec were identified primarily at the edges of the dust lane that is superimposed along the equator of the elliptical galaxy, or just south of it, using interference filters adjusted around the hydrogen Balmer lines and various forbidden lines; the galactic nucleus was also identified as an H II region. Spectroscopic observations in the range 3500 to 6000 A taken with a 1.5 m telescope reveal the presence of a prominent forbidden O II emission line, as well as forbidden O III lines and hydrogen Balmer lines and a blue continuum, and Ca II, Fe and Mg I absorption lines; a broad Na I absorption is also observed in the nucleus. Spectroscopic observations of selected H II regions with a 3.6-m telescope using an image dissector scanner system allow the determination of certain physical parameters, which are generally found to correspond to galactic H II regions, except in the case of the nucleus.
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