III Zw 2: Evolution of a Radio Galaxy in a Nutshell

Details III Zw 2: Evolution of a Radio Galaxy in a Nutshell III Zw 2: Evolution of a Radio Galaxy in a Nutshell

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..143b&link_type=abstract

6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce

Astronomy and Astrophysics

Astronomy

1

Scientific paper

III Zw 2 shows dramatic radio outbursts roughly every five years. Here we present the results of our VLA and VLBA monitoring of the latest flare with an excellent time and frequency sampling. We have discovered superluminal motion with a lower limit for the apparent expansion speed of 1.25 ± 0.09 c at 43 GHz. Spectral and spatial evolution are closely linked. Before and after this rapid expansion we have seen a period of virtually no expansion with an expansion speed of less than 0.04 c. However, at 15 GHz the picture is completely different from the behaviour at 43 GHz. III Zw 2 shows a constant slow expansion (˜0.6 c). The difference between the two frequencies is qualitatively explained by optical depth effects in an 'inflating balloon-model', describing the evolution of radio lobes on an ultra-compact scale. The stop-and-go behaviour could be explained by a jet interacting with a molecular cloud or the molecular torus.

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