A dramatic radio outburst in the quasar 1921-29

Details A dramatic radio outburst in the quasar 1921-29 A dramatic radio outburst in the quasar 1921-29

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.283..747d&link_type=abstract

Nature, vol. 283, Feb. 21, 1980, p. 747, 748. NSF-supported research.

Computer Science

17

Quasars, Radio Bursts, Radio Spectra, Spectrum Analysis, Variable Stars, Extragalactic Radio Sources

Scientific paper

An extremely large-amplitude radio outburst presently occurring in the quasar 1921-29 is reported. Variation curves at radio frequencies from 7.9 to 89.6 GHz taken since 1971 reveal a sharp rise in flux density beginning near 1979.3 at the highest frequency and progressively delayed at lower frequencies, characteristic of a self-absorbed inhomogeneous source. The recent outburst is superimposed on a more slowly varying component which increased gradually through 1976 and 1977, and remained constant until early 1979. The spectrum of the rapid 1979 outburst alone is found to have an initially steep low-frequency cut-off which flattens as the outburst evolved and the frequency of maximum decreased from 100 to 30 GHz. The spectral evolution of both outbursts suggests that both are expanding from an initially smaller volume. At 31 GHz, 1921-29 has become the strongest known quasar in the sky, exceeding even 3C 273.

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