Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.337..143d&link_type=abstract
Nature (ISSN 0028-0836), vol. 337, Jan. 12, 1989, p. 143-145.
Astronomy and Astrophysics
Astronomy
3
Extragalactic Radio Sources, Radiant Flux Density, Sky Surveys (Astronomy), Synchrotron Radiation, H I Regions, Line Of Sight, Morphology, Very Large Array (Vla)
Scientific paper
Direct observational evidence for core variability of two lobe-dominated (weak-core) radio sources, GT1945+241 and GT0304+575, is presented. In the context of the beaming model, weak-core sources have little Doppler boosting and any residual variability is mainly intrinsic. The extreme nature of the core variability of the two sources suggests that the intrinsic variability can dominate beaming-related variability. If future studies reveal that this type of source is common, aspects of the beaming model, particularly in the context of the Unified Scheme, would be brought into question.
Duric Neb
Gregory Philip C.
Tsutsumi Takahiro
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