Other
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt.........4z&link_type=abstract
Ph.D. Thesis California Univ., San Diego.
Other
5
Astronomical Models, Emission Spectra, Gravitational Effects, Photoionization, Quasars, Radiative Transfer, Balmer Series, Energy Distribution, H Alpha Line, H Beta Line, H Gamma Line
Scientific paper
Spectroscopic data on 12 low-redshift QSOs taken in different years are presented as evidence for line variation in QSOs. The broad hydrogen emission lines in these QSOs are found to vary in step with their underlying continua, assuming that the intensities of their forbidden (O III) lines do not change. One QSO, 2135-147, shows a rise in the intensities of its hydrogen lines five years after the increase in its continuum level. It was found that line variations are common in QSOs. The inferred upper limit on the size of broad-emission-line region is between 0.4 to 3 light-years. Such a small size should imply a very high density of ionizing protons. Different Balmer lines undergo different fractional chambers, indicating that complications, probably effects of significant radiative transfer, may be involved. The average ratio of H gamma/H beta is 0.8 for the variable part of the lines, on the other hand, considerably higher than that of the steady part. The derived photon flux should result in an acceleration much stronger than the inward acceleration due to gravity. Therefore, line-emitting clouds would be driven outwards.
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