Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.279..505a&link_type=abstract
Nature, vol. 279, June 7, 1979, p. 505. Research supported by the Science Research Council
Astronomy and Astrophysics
Astronomy
12
Black Holes (Astronomy), Emission Spectra, Stellar Spectrophotometry, Supermassive Stars, Doppler Effect, Infrared Spectra, Line Spectra, Optical Thickness, Red Shift, Stellar Luminosity, Supernova Remnants, Ultraviolet Radiation, X Ray Sources
Scientific paper
The peculiar emission line object SS433, tentatively identified with the supernova remnant W50 and with the X-ray source A1909+04, has been the subject of recent spectrophotometric observations by Margon et al. (in press). In this paper, it is proposed that very strong, broad emission lines at about 6000 and 7400 A, observed in the spectrophotometric study of SS433, are Doppler-shifted H-alpha lines emitted from a ring of matter orbiting a black hole of about one million solar masses. From considerations of the magnitudes of the red and blue shifts, the center of mass of the line, the narrowness of the shifted lines, possible brightness temperatures and the deduced geometry of the emission regions, it is inferred that the compact object around which emission takes place cannot be a neutron star or a light black hole, but must be a massive black hole surrounded by an optically thick accretion disk.
Amitai-Milchgrub A.
Piran Tsvi
Shaham Jacob
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