Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011yera.confe..43s&link_type=abstract
The 41st Young European Radio Astronomers Conference, held at University of Manchester/Jodrell Bank Observatory, 18-20 July 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The term "core-dominated triple" (CDT) radio source was coined for an object which, as seen in FIRST maps, is featured by a relatively bright, point-like central component straddled with a pair of much weaker, often diffuse lobes. We are testing a hypothesis that CDTs could be "concealed" double-double radio sources (DDRS). Typically, the separation of the inner lobes in DDRSs is not less than one order of magnitude compared to that of the outer lobes. It may happen, though, that this ratio is lower and so the inner part is too compact to be properly imaged in the maps encompassing the outer one. As a result, the source does not appear in FIRST maps as a DDRS but as a CDT, and only high-resolution observations can prove that the alleged core is actually a compact double. We observed the cores of 15 CDTs with MERLIN and those that were still unresolved were followed up with the EVN. This way, we discovered a few "concealed" DDRS, i.e. DDRS where the inner double is very young.
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