SN 2007gr: A normal type Ic supernova with a mildly relativistic radio jet?

Zsolt Paragi, Alexander Van Der Horst, Masaomi Tanaka, Gregory Taylor, Chryssa Kouveliotou, Jonathan Granot, Enrico Ramirez-Ruiz, Yurii Pidopryhora, Stephen Bourke, Robert Campbell, Michael Garrett, Huib Van Langevelde

Research output: Contribution to journalConference articlepeer-review


A nearby type Ic supernova, SN 2007gr was observed with the EVN in two epochs 60 days apart (second observation also included the Green Bank Telescope). In both cases one of the EVN stations was the Westerbork Synthesis Radio Telescope (WSRT), which recorded the observational data not only in the VLBI mode, but also in its normal interferometric mode. Thus it provided an important reference observation. In the first epoch the fluxes measured by the VLBI network and the WSRT alone match well. However in the second epoch the peak brightness observed in the VLBI experiment is much lower than the total flux recorded by the WSRT. There could be multiple reasons for this discrepancy: a resolution effect, coherence losses in VLBI, or extended emission contaminating the WSRT measurement. With new WSRT observations we costrain the level of background emission and find that there is still a difference between the corrected total flux density and the VLBI peak brightness. If one assumes that this is dominated by resolution, this would correspond to an average apparent expansion speed of ∼ 0.4c.

Original languageEnglish
JournalProceedings of Science
StatePublished - 2010
Externally publishedYes
Event10th European VLBI Network Symposium and EVN Users Meeting: VLBI and the New Generation of Radio Arrays, EVN Symposium 2010 - Manchester, United Kingdom
Duration: 20 Sep 201024 Sep 2010

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