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Is there a mildly relativistic jet in SN2007gr?


Paragi, Z and van der Horst, AJ and Tanaka, M and Taylor, GB and Kouveliotou, C and Granot, J and Ramirez-Ruiz, E and Pidopryhora, Y and Bourke, S and Campbell, RM and Garrett, MA and van Langevelde, HJ, Is there a mildly relativistic jet in SN2007gr?, Proceedings of the International Astronomical Union 2010: Jets at all Scales, September 2010, pp. 319-320. (2011) [Non Refereed Conference Paper]

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SN2007gr was an ordinary type Ic supernova, with a hint of asymmetric explosion seen in the optical polarization spectrum. This type of SNe is occasionally associated with long duration gamma-ray bursts which generate ultra-relativistic jets; no relativistic outflows have yet been found by direct imaging in SNe Ib/c explosions. High resolution very long baseline interferometry (VLBI) data and simultaneous total radio flux density measurements indicated that SN2007gr has expanded mildly relativistically. We performed late time Westerbork Synthesis Radio Telescope (WSRT) observations to measure the level of the underlying extended emission. Comparison of the VLBI and the background-subtracted WSRT and independent VLA data indicate an at least partially resolved source with an average expansion velocity of >=0.4c, although the VLBI data could be consistent with a fainter source with an expansion velocity of ~0.2c as well.

Item Details

Item Type:Non Refereed Conference Paper
Keywords:supernovae; general supernovae; individual (SN 2007gr) ISM; jets and outflows radio continuum; general techniques;interferometric
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, Y (Dr Yurii Pidopryhora)
ID Code:95777
Year Published:2011
Deposited By:Mathematics and Physics
Deposited On:2014-10-08
Last Modified:2022-09-01

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