Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226l..79o&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 226, Dec. 1, 1978, p. L79-L82.
Astronomy and Astrophysics
Astronomy
37
Early Stars, Galactic Structure, Microwave Emission, Radio Sources (Astronomy), Supergiant Stars, H Alpha Line, H Ii Regions, Hydrogen Ions, Nebulae, Peculiar Galaxies, Stellar Radiation, Ubv Spectra
Scientific paper
Observations with an image-tube spectrograph and SIT vidicon system of compact H-alpha knots and blue stellar objects (BSOs) at distances between 13 and 24 kpc from the nucleus of the peculiar elliptical galaxy NGC 5128 are reported. The data for two BSOs are shown to be entirely consistent with the objects' being early-type supergiants having respective absolute magnitudes of -8.8 and -7.5. The brightest H-alpha knot is identified as a typical galactic H II region of moderate excitation. It is found that three other H-alpha condensations have quite complex spatial and velocity structure, exhibit properties typical of H II regions, but are characterized by unusually high degrees of ionization. The origin of the ionized gas is briefly considered.
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