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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents

ID: 125431.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
III Zw 2 : evolution of a radio galaxy in a nutshell
Authors:Brunthaler, A.; Falcke, H.; Bower, G. C.; Aller, M. F.; Aller, H. D.; Terasranta, H.; Krichbaum, T. P.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Publications of the Astronomical Society of Australia
Journal Abbrev.:Publ. Astron. Soc. Aust.
Issue / Number:1
Start Page:126
End Page:128
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:IIIZw 2 shows dramatic radio outbursts roughly every five years. Here we present the light curves and VLBA observations of the latest flare with an excellent time sampling. We have detected 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 and the evolution of III Zw 2 in a turnover frequency vs. linear size diagram is similar to the correlation for GPS and CSS sources. Before and after this rapid expansion we observe a period of virtually no expansion. However, at 15 GHz III Zw 2 shows a constant slow expansion (similar to 0.6 c). The difference 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.
Free Keywords:galaxies : active, galaxies : individual (III Zw 2), galaxies : jets
Comment of the Author/Creator:Date: 2003
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Max Planck Inst Radioastron, D-53121 Bonn, Germany.; Univ Calif Berkeley, Radio Astron Lab, Berkeley, CA 94720 USA.; Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA.; Metsahovi Radio Observ, Metsahovintie 02540, Kylmala, Finland.
Identifiers:ISI:000183277800031 [ID No:1]
ISSN:1323-3580 [ID No:2]
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