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This is a preliminary report of the continuing search for significant optical microvariability in a selected sample of radio-quiet
and radio-loud quasi-stellar objects (QSOs). Total of 24 Paloma-Green (PG) quasars are observed. Among them, 17 objects are
classified as radio-quiet and seven objects are classified radio-loud. In this classification, the ratio R, radio to optical
flux density, is required to be less than 1 in order to assure the objects are reasonably radio-quiet. Two out of 17 radio-quiet
QSOs and six out of eight radio-loud QSOs were microvariable. This apparent contrast in microvariations between radio-quiet
and radio-loud QSOs does not provide firm support for the theoretical model utilizing discrete events in accretion disks and
implies substantial support for models based on propagating shocks on relativistic jets as the likely process responsible
for producing most of the microvariations are observed in AGNs. 相似文献
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