The expansion of SN 2008iz in M82

Details The expansion of SN 2008iz in M82 The expansion of SN 2008iz in M82

2010-11-24

arxiv.org/abs/1011.5316v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

submitted to the proceedings of the 10th European VLBI Network symposium, PoS(10th EVN Symposium)055, 6 pages 2 figures, also

Scientific paper

We present first results from the ongoing radio monitoring of SN 2008iz in M82. The VLBI images reveal a shell-like structure with circular symmetry, which expands in a self-similar way. There is strong evidence of a compact component with a steep spectrum at the center of the shell. The expansion curve obtained from our VLBI observations is marginally decelerated (m = 0.89) and can be modeled simultaneously with the available radio light curves. While the results of this simultaneous fitting are not conclusive (i.e. different combinations of values of the magnetic field, CSM density profile, and electron energy distribution, provide fits to the available data with similar quality), additional observations should allow a more robust and detailed modeling.

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