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


Paragi, Z and van der Horst, A and Tanaka, M and Taylor, G and Kouveliotou, C and Granot, J and Ramirez-Ruiz, E and Pidopryhora, YM and Bourke, S and Campbell, R and Garrett, M and van Langevelde, H, SN 2007gr: a normal type lc supernova with a mildly relativistic radio jet?, Proceedings of the 10th European VLBI Network Symposium and EVN Users, 20-24 September 2010, Manchester, United Kingdom, pp. 1-4. (2010) [Non Refereed Conference Paper]

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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.

Item Details

Item Type:Non Refereed Conference Paper
Keywords:SN2007gr, supernova, radio astronomy, VLBI, jet
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Stellar astronomy and planetary systems
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Pidopryhora, YM (Dr Yurii Pidopryhora)
ID Code:95819
Year Published:2010
Deposited By:Mathematics and Physics
Deposited On:2014-10-08
Last Modified:2014-10-09

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