Computer Science
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.291..394s&link_type=abstract
Nature, vol. 291, June 4, 1981, p. 394-396.
Computer Science
7
Continuous Radiation, Quasars, Stellar Magnetic Fields, Stellar Radiation, Stellar Rotation, Thermal Emission, Abundance, Gyromagnetism, Nonthermal Radiation, Spectral Energy Distribution, Stellar Mass Accretion, Stellar Models, Stellar Spectra
Scientific paper
The thermal continuum predicted by magnetic rotator models of the quasar energy source is analyzed. Expressions are derived for the thermal and electromagnetic emission from a supermassive rotator represented as a polytrope in which radiation pressure dominates gas pressure in an almost spherical high-entropy configuration in an equilibrium hydrogen-burning phase. A composite thermal-nonthermal spectrum is calculated for a rotator with a mass of 6 x 10 to the 7th solar masses and cosmic abundance, and it is shown that the combination of nonthermal emission from the light cylinder and thermal emission from the rotator can account for the observed flattening of the continuum in the blue. In addition, it is suggested that the observed spectra minima near 4000 and 2000 A and continuum maximum near 3000 A may be explained by absorbing dust particles, the onset of the thermal continuum excess, and the intermediate emission excess, respectively.
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