Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122..111m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 111-118.
Astronomy and Astrophysics
Astrophysics
8
Galactic Nuclei, H Ii Regions, Interstellar Radiation, Line Shape, Optical Emission Spectroscopy, Spiral Galaxies, B Stars, Gas Ionization, Hydrogen Ions, Line Spectra, O Stars, Radiative Transfer, Stellar Mass, Stellar Winds, Supernovae
Scientific paper
The spiral galaxy MCG-05-32-052 has a supergiant H II region surrounding its nucleus. The outer regions of this galaxy are in circular motion at ≅115 km s-1 but non-circular motions over a range of 100 km s-1 are found around the nucleus. Brightness ratios of the optical emission lines indicate that radiative ionization is predominant and a rate of emission of Lyman photons in the range 0.4 to 1.3×1053 s-1 is required to produce the total Hα intensity. A total ionized mass in the range 1.3 to 4×107 M_sun; is calculated and the total stellar mass in the central regions out to a radius of 1450 pc is given as 2.4×109 M_sun;. Three sources for this ionization and large motions are considered: either rich clusters of numerous ordinary OB stars with stellar winds and recurrent supernova explosions or one or several supermassive stars like the central object R 136a inside the 30 Dor nebula.
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