Computer Science
Scientific paper
May 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964natur.202..786f&link_type=abstract
Nature, Volume 202, Issue 4934, pp. 786-787 (1964).
Computer Science
7
Scientific paper
THE large energies and short time-scales characteristic of the quasi-stellar radio sources present major problems for their interpretation. The total power emitted by 3C 48 is estimated to be 2 × 1046 ergs/sec1. The presence of nebulosity around 3C 48 (ref. 1) and 3C 273 (ref. 2) suggests lifetimes of at least 5 × 1012 sec, so that the emitted energy exceeds 1059 ergs. If a major part of this energy is in the form of synchrotron radiation, this is a lower limit to the energy contained in relativistic electrons. Similar lower limits follow for the relativistic particle energies in bright radio galaxies, even if the proton component is small3. The appearance of the nebulosity and the ratio of radius to velocity suggest that the lifetime of these objects is not much greater than 106 years. Both sources are observed to vary in optical brightness over a period of years4,5, and there is some evidence that 3C 48 varies over a period of weeks as well1.
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